# What is CVE-2021-28199? > CVE-2021-28199 is a medium-severity flaw (CVSS 4.9) in Asmb9-Ikvm Firmware from Asus, published on 6 April 2021. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 1.8%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-28199 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 21 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 4.9 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 1.8% (latest exploit-likelihood forecast) - **Published:** 6 April 2021 - **Record last updated:** 13 April 2021 - **Main product:** Asmb9-Ikvm Firmware from Asus - **Affected products:** 88 ## What is CVE-2021-28199? In plain terms It can be attacked from anywhere on the internet with an administrator account, and nobody has to click anything. If it works, the attacker can take it offline. ### The official description The specific function in ASUS BMC’s firmware Web management page (Modify user’s information function) does not verify the string length entered by users, resulting in a Buffer overflow vulnerability. As obtaining the privileged permission, remote attackers use the leakage to abnormally terminate the Web service. ### What kind of flaw is it? - CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Easy: no special conditions - Login needed first: An administrator account - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can take it offline Severity vector: `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H` ## Is CVE-2021-28199 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 1.8%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 1.8%, 1.8%, 1.8%, 1.8%, 1.8%, 1.8%, 1.8%. ### Timeline - 6 April 2021: Published - 13 April 2021: Record last updated ### How Precursor Intelligence ranks it CVE-2021-28199 scores **21 out of 100 (Low)**, with the action "Monitor". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2021-28199? The published record lists 88 products. - [Asmb9-Ikvm Firmware](https://www.precursorintelligence.com/product/asus/asmb9-ikvm_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.11.12 - [Asmb9-Ikvm](https://www.precursorintelligence.com/product/asus/asmb9-ikvm) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [E700 G4](https://www.precursorintelligence.com/product/asus/e700_g4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [E700 G4 Firmware](https://www.precursorintelligence.com/product/asus/e700_g4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Esc4000 Dhd G4](https://www.precursorintelligence.com/product/asus/esc4000_dhd_g4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Esc4000 Dhd G4 Firmware](https://www.precursorintelligence.com/product/asus/esc4000_dhd_g4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.13.7 - [Esc4000 G4](https://www.precursorintelligence.com/product/asus/esc4000_g4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Esc4000 G4 Firmware](https://www.precursorintelligence.com/product/asus/esc4000_g4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Esc4000 G4x](https://www.precursorintelligence.com/product/asus/esc4000_g4x) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Esc4000 G4x Firmware](https://www.precursorintelligence.com/product/asus/esc4000_g4x_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.11.6 - [Esc8000 G4](https://www.precursorintelligence.com/product/asus/esc8000_g4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Esc8000 G4 Firmware](https://www.precursorintelligence.com/product/asus/esc8000_g4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.4 - Esc8000 G4/10g by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - Esc8000 G4/10g Firmware by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.4 - [Knpa-U16](https://www.precursorintelligence.com/product/asus/knpa-u16) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Knpa-U16 Firmware](https://www.precursorintelligence.com/product/asus/knpa-u16_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.13.4 - [Pro E800 G4](https://www.precursorintelligence.com/product/asus/pro_e800_g4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Pro E800 G4 Firmware](https://www.precursorintelligence.com/product/asus/pro_e800_g4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.2 - [Rs100-E10-Pi2](https://www.precursorintelligence.com/product/asus/rs100-e10-pi2) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs100-E10-Pi2 Firmware](https://www.precursorintelligence.com/product/asus/rs100-e10-pi2_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.13.6 - [Rs300-E10-Ps4](https://www.precursorintelligence.com/product/asus/rs300-e10-ps4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs300-E10-Ps4 Firmware](https://www.precursorintelligence.com/product/asus/rs300-e10-ps4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.13.6 - [Rs300-E10-Rs4](https://www.precursorintelligence.com/product/asus/rs300-e10-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs300-E10-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs300-e10-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.13.6 - [Rs500-E9-Ps4](https://www.precursorintelligence.com/product/asus/rs500-e9-ps4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500-E9-Ps4 Firmware](https://www.precursorintelligence.com/product/asus/rs500-e9-ps4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.4 - [Rs500-E9-Rs4](https://www.precursorintelligence.com/product/asus/rs500-e9-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500-E9-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs500-e9-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.4 - [Rs500-E9-Rs4-U](https://www.precursorintelligence.com/product/asus/rs500-e9-rs4-u) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500-E9-Rs4-U Firmware](https://www.precursorintelligence.com/product/asus/rs500-e9-rs4-u_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.4 - [Rs500a-E10-Ps4](https://www.precursorintelligence.com/product/asus/rs500a-e10-ps4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500a-E10-Ps4 Firmware](https://www.precursorintelligence.com/product/asus/rs500a-e10-ps4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Rs500a-E10-Rs4](https://www.precursorintelligence.com/product/asus/rs500a-e10-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500a-E10-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs500a-e10-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Rs500a-E9 Rs4 U](https://www.precursorintelligence.com/product/asus/rs500a-e9_rs4_u) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500a-E9 Rs4 U Firmware](https://www.precursorintelligence.com/product/asus/rs500a-e9_rs4_u_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Rs500a-E9-Ps4](https://www.precursorintelligence.com/product/asus/rs500a-e9-ps4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500a-E9-Ps4 Firmware](https://www.precursorintelligence.com/product/asus/rs500a-e9-ps4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Rs500a-E9-Rs4](https://www.precursorintelligence.com/product/asus/rs500a-e9-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs500a-E9-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs500a-e9-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Rs520-E9-Rs12-E](https://www.precursorintelligence.com/product/asus/rs520-e9-rs12-e) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs520-E9-Rs12-E Firmware](https://www.precursorintelligence.com/product/asus/rs520-e9-rs12-e_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.3 - [Rs520-E9-Rs8](https://www.precursorintelligence.com/product/asus/rs520-e9-rs8) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs520-E9-Rs8 Firmware](https://www.precursorintelligence.com/product/asus/rs520-e9-rs8_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.3 - [Rs700-E9-Rs12](https://www.precursorintelligence.com/product/asus/rs700-e9-rs12) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs700-E9-Rs12 Firmware](https://www.precursorintelligence.com/product/asus/rs700-e9-rs12_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.11.5 - [Rs700-E9-Rs4](https://www.precursorintelligence.com/product/asus/rs700-e9-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs700-E9-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs700-e9-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.09 - [Rs700a-E9-Rs12v2](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs12v2) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs700a-E9-Rs12v2 Firmware](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs12v2_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - [Rs700a-E9-Rs4](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs4) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs700a-E9-Rs4 Firmware](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs4_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.10.0 - [Rs700a-E9-Rs4v2](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs4v2) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs700a-E9-Rs4v2 Firmware](https://www.precursorintelligence.com/product/asus/rs700a-e9-rs4v2_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - [Rs720-E9-Rs12-E](https://www.precursorintelligence.com/product/asus/rs720-e9-rs12-e) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720-E9-Rs12-E Firmware](https://www.precursorintelligence.com/product/asus/rs720-e9-rs12-e_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Rs720-E9-Rs24-U](https://www.precursorintelligence.com/product/asus/rs720-e9-rs24-u) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720-E9-Rs24-U Firmware](https://www.precursorintelligence.com/product/asus/rs720-e9-rs24-u_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.3 - [Rs720-E9-Rs8-G](https://www.precursorintelligence.com/product/asus/rs720-e9-rs8-g) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720-E9-Rs8-G Firmware](https://www.precursorintelligence.com/product/asus/rs720-e9-rs8-g_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Rs720a-E9-Rs12v2](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs12v2) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720a-E9-Rs12v2 Firmware](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs12v2_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.2 - [Rs720a-E9-Rs24-E](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs24-e) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720a-E9-Rs24-E Firmware](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs24-e_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.10.3 - [Rs720a-E9-Rs24v2](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs24v2) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720a-E9-Rs24v2 Firmware](https://www.precursorintelligence.com/product/asus/rs720a-e9-rs24v2_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - [Rs720q-E9-Rs24-S](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs24-s) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720q-E9-Rs24-S Firmware](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs24-s_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.0 - [Rs720q-E9-Rs8](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs8) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720q-E9-Rs8 Firmware](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs8_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.0 - [Rs720q-E9-Rs8-S](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs8-s) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Rs720q-E9-Rs8-S Firmware](https://www.precursorintelligence.com/product/asus/rs720q-e9-rs8-s_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.0 - Ws C422 Pro/se by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - Ws C422 Pro/se Firmware by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Ws C621e Sage](https://www.precursorintelligence.com/product/asus/ws_c621e_sage) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Ws C621e Sage Firmware](https://www.precursorintelligence.com/product/asus/ws_c621e_sage_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - Ws X299 Pro/se by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - Ws X299 Pro/se Firmware by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Z11pa-D8](https://www.precursorintelligence.com/product/asus/z11pa-d8) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Z11pa-D8 Firmware](https://www.precursorintelligence.com/product/asus/z11pa-d8_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Z11pa-D8c](https://www.precursorintelligence.com/product/asus/z11pa-d8c) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Z11pa-D8c Firmware](https://www.precursorintelligence.com/product/asus/z11pa-d8c_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.14.1 - [Z11pa-U12](https://www.precursorintelligence.com/product/asus/z11pa-u12) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Z11pa-U12 Firmware](https://www.precursorintelligence.com/product/asus/z11pa-u12_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - Z11pa-U12/10g-2s by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - Z11pa-U12/10g-2s Firmware by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.1 - [Z11pr-D16](https://www.precursorintelligence.com/product/asus/z11pr-d16) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Hardware): version not specified - [Z11pr-D16 Firmware](https://www.precursorintelligence.com/product/asus/z11pr-d16_firmware) by [Asus](https://www.precursorintelligence.com/vendors/asus) (Operating system): 1.15.3 ## How do I fix CVE-2021-28199? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisories and patch notes first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [asus.com](https://www.asus.com/content/ASUS-Product-Security-Advisory/) (Vendor advisory) - [asus.com](https://www.asus.com/tw/support/callus/) (Vendor advisory) - [twcert.org.tw](https://www.twcert.org.tw/tw/cp-132-4569-6b391-1.html) (Third-party advisory) ## Questions ### What is CVE-2021-28199? CVE-2021-28199 is a medium-severity flaw in Asmb9-Ikvm Firmware from Asus, published on 6 April 2021. It can be attacked from anywhere on the internet with an administrator account, and nobody has to click anything. If it works, the attacker can take it offline. ### How serious is CVE-2021-28199? It scores 4.9 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2021-28199 is 21 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2021-28199 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 1.8%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2021-28199 affect? For Asmb9-Ikvm Firmware from Asus: 1.11.12. The record lists 88 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-28199? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2021-28199 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact