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CVE-2021-34816

24
FAUCET Score

CVE-2021-34816 describes an Argument Injection vulnerability in Etherpad 1.8.13's plugin management, allowing privileged users to execute arbitrary code on the server by installing malicious plugins. With a CVSS score of 7.2 (HIGH), this vulnerability has a network attack vector, low attack complexity, and can lead to complete compromise of confidentiality, integrity, and availability. While there is no known active exploitation (KEV: No) and no public exploit code (Metasploit, Nuclei, ExploitDB: None), the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
1.8.13CPE matchmatch criteria
cpe:2.3:a:etherpad:etherpad:1.8.13:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.23%
Probability of exploitation in next 30 days
EPSS Percentile
80.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0223 is in the 78th percentile among its peer group of 5,531 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.sonarsource.com / etherpad-code-execution-vulnerabilities
ExploitThird Party Advisory
github.com / ether/etherpad-lite/releases
Release NotesThird Party Advisory