CVE-2021-34816
CVE-2021-34816 is a high-severity vulnerability in Etherpad with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-88.
Key facts
- Severity: High (CVSS 3.x base score 7.2)
- CVSS v2: 6.5
- EPSS exploit prediction: 2% (81st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-88
- Affected product: Etherpad
- Published:
- Last modified:
Description
An Argument Injection issue in the plugin management of Etherpad 1.8.13 allows privileged users to execute arbitrary code on the server by installing plugins from an attacker-controlled source.
Frequently asked questions
- What is CVE-2021-34816?
- An Argument Injection issue in the plugin management of Etherpad 1.8.13 allows privileged users to execute arbitrary code on the server by installing plugins from an attacker-controlled source.
- How severe is CVE-2021-34816?
- CVE-2021-34816 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-34816 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-34816?
- CVE-2021-34816 affects Etherpad. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-34816?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-34816 published?
- CVE-2021-34816 was published on 2021-07-21 and last updated on 2026-06-17.
References
- https://blog.sonarsource.com/etherpad-code-execution-vulnerabilities
- https://github.com/ether/etherpad-lite/releases
Affected products (1)
- cpe:2.3:a:etherpad:etherpad:1.8.13:*:*:*:*:*:*:*
More vulnerabilities in Etherpad
- CVE-2021-43802 — Critical (CVSS 9.9): Etherpad is a real-time collaborative editor. In versions prior to 1.8.16, an attacker can craft an `*.etherpad` file…
- CVE-2018-9326 — Critical (CVSS 9.8): Etherpad 1.6.3 before 1.6.4 allows an attacker to execute arbitrary code.
- CVE-2018-6835 — Critical (CVSS 9.8): node/hooks/express/apicalls.js in Etherpad Lite before v1.6.3 mishandles JSONP, which allows remote attackers to bypass…
- CVE-2018-9327 — High (CVSS 8.1): Etherpad 1.5.x and 1.6.x before 1.6.4 allows an attacker to execute arbitrary code on the server. The instance has to…
- CVE-2020-22785 — High (CVSS 7.5): Etherpad < 1.8.3 is affected by a missing lock check which could cause a denial of service. Aggressively targeting…
- CVE-2020-22782 — High (CVSS 7.5): Etherpad < 1.8.3 is affected by a denial of service in the import functionality. Upload of binary file to the import…
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- CVE-2007-0882 — Critical (CVSS 10.0): Argument injection vulnerability in the telnet daemon (in.telnetd) in Solaris 10 and 11 (SunOS 5.10 and 5.11)…
- CVE-2004-0480 — Critical (CVSS 10.0): Argument injection vulnerability in IBM Lotus Notes 6.0.3 and 6.5 allows remote attackers to execute arbitrary code via…
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