# What is CVE-2019-19825? > CVE-2019-19825 is a critical-severity flaw (CVSS 9.8) in A3002ru from Totolink, published on 27 January 2020. 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 30%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-19825 ## At a glance - **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. - **Precursor Intelligence risk score:** 90 out of 100 (Critical); action: Emergency patch. Kept up to date as the evidence changes. - **Severity:** Critical (CVSS 9.8 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:** 30% (latest exploit-likelihood forecast) - **Published:** 27 January 2020 - **Record last updated:** 5 February 2020 - **Main product:** A3002ru from Totolink - **Affected products:** 16 ## What is CVE-2019-19825? 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 On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass. (Also, the CAPTCHA text is not needed once the attacker has determined valid credentials. The attacker can perform router actions via HTTP requests with Basic Authentication.) This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, and N100RE through 3.4.0. ### What kind of flaw is it? - CWE-287: Improper Authentication ### 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: 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2019-19825 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 30%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 30%, 30%, 30%, 30%, 30%, 30%, 30%. ### Timeline - 27 January 2020: Published - 5 February 2020: Record last updated - 23 November 2025: Exploit likelihood jumped - 19 December 2025: Exploit likelihood fell ### How Precursor Intelligence ranks it CVE-2019-19825 scores **90 out of 100 (Critical)**, with the action "Emergency patch". 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-2019-19825? The published record lists 16 products. - [A3002ru](https://www.precursorintelligence.com/product/totolink/a3002ru) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [A3002ru Firmware](https://www.precursorintelligence.com/product/totolink/a3002ru_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 2.0.0 - [A702r](https://www.precursorintelligence.com/product/totolink/a702r) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [A702r Firmware](https://www.precursorintelligence.com/product/totolink/a702r_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 2.1.3 - [N100re](https://www.precursorintelligence.com/product/totolink/n100re) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N100re Firmware](https://www.precursorintelligence.com/product/totolink/n100re_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 3.4.0 - [N150rt](https://www.precursorintelligence.com/product/totolink/n150rt) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N150rt Firmware](https://www.precursorintelligence.com/product/totolink/n150rt_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 3.4.0 - [N200re](https://www.precursorintelligence.com/product/totolink/n200re) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N200re Firmware](https://www.precursorintelligence.com/product/totolink/n200re_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 4.0.0 - [N300rt](https://www.precursorintelligence.com/product/totolink/n300rt) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N300rt Firmware](https://www.precursorintelligence.com/product/totolink/n300rt_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 3.4.0 - [N301rt](https://www.precursorintelligence.com/product/totolink/n301rt) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N301rt Firmware](https://www.precursorintelligence.com/product/totolink/n301rt_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 2.1.6 - [N302r](https://www.precursorintelligence.com/product/totolink/n302r) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Hardware): version not specified - [N302r Firmware](https://www.precursorintelligence.com/product/totolink/n302r_firmware) by [Totolink](https://www.precursorintelligence.com/vendors/totolink) (Operating system): up to 3.4.0 ## How do I fix CVE-2019-19825? 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 - [packetstormsecurity.com](http://packetstormsecurity.com/files/156083/Realtek-SDK-Information-Disclosure-Code-Execution.html) (Third-party advisory, Vulnerability database) - [seclists.org](http://seclists.org/fulldisclosure/2020/Jan/36) (Mailing list, Third-party advisory) - [seclists.org](http://seclists.org/fulldisclosure/2020/Jan/38) (Mailing list, Third-party advisory) - [sploit.tech](https://sploit.tech) (Exploit, Third-party advisory) ## Questions ### What is CVE-2019-19825? CVE-2019-19825 is a critical-severity flaw in A3002ru from Totolink, published on 27 January 2020. 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-2019-19825? It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2019-19825 is 90 out of 100, which is Critical. Its action is "Emergency patch". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. ### Is CVE-2019-19825 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 30%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2019-19825 affect? For A3002ru from Totolink: version not specified. The record lists 16 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2019-19825? 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-2019-19825 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