# What is CVE-2021-35979? > CVE-2021-35979 is a high-severity flaw (CVSS 8.1) in Realport from Digi, published on 8 October 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 0.9%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-35979 ## 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:** 46 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** High (CVSS 8.1 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:** 0.9% (latest exploit-likelihood forecast) - **Published:** 8 October 2021 - **Record last updated:** 26 May 2023 - **Main product:** Realport from Digi - **Affected products:** 35 ## What is CVE-2021-35979? In plain terms It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description An issue was discovered in Digi RealPort through 4.8.488.0. The 'encrypted' mode is vulnerable to man-in-the-middle attacks and does not perform authentication. ### What kind of flaw is it? - CWE-306: Missing Authentication for Critical Function ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Hard: conditions must line up - Login needed first: No login needed - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data, change data and take it offline Severity vector: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2021-35979 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 0.9%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%. ### Timeline - 8 October 2021: Published - 26 May 2023: Record last updated ### How Precursor Intelligence ranks it CVE-2021-35979 scores **46 out of 100 (Medium)**, with the action "Plan remediation". 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-2021-35979? The published record lists 35 products. - [Realport](https://www.precursorintelligence.com/product/digi/realport) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Application): up to 1.9-40, up to 4.8.488.0 - [6350-Sr](https://www.precursorintelligence.com/product/digi/6350-sr) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [6350-Sr Firmware](https://www.precursorintelligence.com/product/digi/6350-sr_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Cm](https://www.precursorintelligence.com/product/digi/cm) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Cm Firmware](https://www.precursorintelligence.com/product/digi/cm_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Connect Es](https://www.precursorintelligence.com/product/digi/connect_es) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Connect Es Firmware](https://www.precursorintelligence.com/product/digi/connect_es_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - Connectport Lts 8/16/32 by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - Connectport Lts 8/16/32 Firmware by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - Connectport Ts 8/16 by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - Connectport Ts 8/16 Firmware by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [One Ia](https://www.precursorintelligence.com/product/digi/one_ia) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [One Ia Firmware](https://www.precursorintelligence.com/product/digi/one_ia_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [One Iap Family](https://www.precursorintelligence.com/product/digi/one_iap_family) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [One Iap Family Firmware](https://www.precursorintelligence.com/product/digi/one_iap_family_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Passport Integrated Console Server](https://www.precursorintelligence.com/product/digi/passport_integrated_console_server) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Passport Integrated Console Server Firmware](https://www.precursorintelligence.com/product/digi/passport_integrated_console_server_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Portserver Ts](https://www.precursorintelligence.com/product/digi/portserver_ts) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Portserver Ts Firmware](https://www.precursorintelligence.com/product/digi/portserver_ts_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Portserver Ts M Mei](https://www.precursorintelligence.com/product/digi/portserver_ts_m_mei) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Portserver Ts M Mei Firmware](https://www.precursorintelligence.com/product/digi/portserver_ts_m_mei_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Portserver Ts Mei](https://www.precursorintelligence.com/product/digi/portserver_ts_mei) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Portserver Ts Mei Firmware](https://www.precursorintelligence.com/product/digi/portserver_ts_mei_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Portserver Ts Mei Hardened](https://www.precursorintelligence.com/product/digi/portserver_ts_mei_hardened) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Portserver Ts Mei Hardened Firmware](https://www.precursorintelligence.com/product/digi/portserver_ts_mei_hardened_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Portserver Ts P Mei](https://www.precursorintelligence.com/product/digi/portserver_ts_p_mei) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Portserver Ts P Mei Firmware](https://www.precursorintelligence.com/product/digi/portserver_ts_p_mei_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Transport Wr11 Xt](https://www.precursorintelligence.com/product/digi/transport_wr11_xt) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Transport Wr11 Xt Firmware](https://www.precursorintelligence.com/product/digi/transport_wr11_xt_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Wr21](https://www.precursorintelligence.com/product/digi/wr21) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Wr21 Firmware](https://www.precursorintelligence.com/product/digi/wr21_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Wr31](https://www.precursorintelligence.com/product/digi/wr31) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Wr31 Firmware](https://www.precursorintelligence.com/product/digi/wr31_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions - [Wr44 R](https://www.precursorintelligence.com/product/digi/wr44_r) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Hardware): version not specified - [Wr44 R Firmware](https://www.precursorintelligence.com/product/digi/wr44_r_firmware) by [Digi](https://www.precursorintelligence.com/vendors/digi) (Operating system): all versions ## How do I fix CVE-2021-35979? 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 latest update from the vendor. The references list where the vendor has published details. 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 - [raw.githubusercontent.com](https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txt) (Third-party advisory) ## Questions ### What is CVE-2021-35979? CVE-2021-35979 is a high-severity flaw in Realport from Digi, published on 8 October 2021. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2021-35979? It scores 8.1 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2021-35979 is 46 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2021-35979 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 0.9%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2021-35979 affect? For Realport from Digi: up to 1.9-40, up to 4.8.488.0. The record lists 35 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-35979? Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2021-35979 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