How severe is CVE-2021-22911?

CVE-2021-22911 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-22911?

Affected package information for CVE-2021-22911 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-22911?

No fixed version has been published for CVE-2021-22911 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-22911 actively exploited in the wild?

Yes. There are 10 known exploit references for CVE-2021-22911, including 2 documented proof-of-concept exploits on Exploit-DB and 6 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-22911?

CVE-2021-22911 has an EPSS (Exploit Prediction Scoring System) score of 91.8%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2021-22911?

CVE-2021-22911 is classified as CWE-75 (CWE-75). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2021-22911?

A Nuclei detection template exists for CVE-2021-22911, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2021-22911 published, and has it been updated?

CVE-2021-22911 was published on May 27, 2021 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2021-22911

CRITICAL

Published

May 27, 2021

Updated

Apr 10, 2026

Affected

0 pkgs

Patched

None yet

Exploits

10 known

EPSS Exploitation Probability

via FIRST.org ↗

91.8%probability of exploitation in next 30 days

Very High Risk100th percentile-0.51%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

A improper input sanitization vulnerability exists in Rocket.Chat server 3.11, 3.12 & 3.13 that could lead to unauthenticated NoSQL injection, resulting potentially in RCE.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-49960webappslinux✓ Verified

Rocket.Chat 3.12.1 - NoSQL Injection (Unauthenticated)

by enox · Jun 7, 2021

Exploit-DB Source

EDB-50108webappslinux✓ Verified

Rocket.Chat 3.12.1 - NoSQL Injection to RCE (Unauthenticated) (2)

by enox · Jul 7, 2021

Exploit-DB Source

Frequently Asked Questions

A improper input sanitization vulnerability exists in Rocket.Chat server 3.11, 3.12 & 3.13 that could lead to unauthenticated NoSQL injection, resulting potentially in RCE.

O3 Security · Impact-Aware SCA

Is CVE-2021-22911 in your stack?

O3 detects CVE-2021-22911 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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