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CRITICAL severity

CVE-2021-22911 — rocket.chat

CRITICAL

CVE-2021-22911 is a critical-severity (CVSS 9.8) CWE-75 vulnerability. 10 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
10 known
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
95.2%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
91.5%93.0%94.6%96.1%92.3%92.3%95.2%95.2%Apr 26Jul 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-22911 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

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.

Affected Products

1 product · 3 configurations
Application
rocket.chatrocket.chat
3 versions
3.11.03.12.03.13.0
Exploits & PoCs
10

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

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2021-22911 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.

How to detect CVE-2021-22911

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2021-22911 -u https://target
Template
Rocket.Chat <=3.13 - NoSQL Injection
Severity
critical
Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary NoSQL queries, leading to unauthorized access, data manipulation, or denial of service.
Remediation
Upgrade Rocket.Chat to a version higher than 3.13 or apply the provided patch to mitigate the vulnerability.

Template by ProjectDiscovery nuclei-templates (tess, sullo), MIT licensed. View the full template. Scan only systems you are authorised to test.

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.
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CVE-2021-22911: rocket.chat RCE (Critical 9.8)