Cyber Resilience

CVE-2021-22911

Rocket.Chat 3.11.0 … 3.13.0

Public PoCHigh EPSS
Published
27 May 2021
Modified
21 November 2024
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.95 99.9th percentile
Risk Priority 97 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2021-22911 is a critical-severity Special Element Injection (CWE-75) vulnerability in Rocket.Chat Rocket.Chat. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Content Injection (T1659); ranked in the top 0.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

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.

CWE(s)
CWE-75NVD-CWE-Other

Related Threats

MITRE ATT&CK Enterprise Techniques

T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-45621Same product: Rocket.Chat Rocket.Chat
CVE-2024-46934Same product: Rocket.Chat Rocket.Chat
CVE-2024-47048Same product: Rocket.Chat Rocket.Chat
CVE-2026-29198Same product: Rocket.Chat Rocket.Chat
CVE-2023-28358Same product: Rocket.Chat Rocket.Chat
CVE-2024-39713Same product: Rocket.Chat Rocket.Chat
CVE-2026-30833Same product: Rocket.Chat Rocket.Chat
CVE-2023-28359Same product: Rocket.Chat Rocket.Chat
CVE-2023-23917Same product: Rocket.Chat Rocket.Chat
CVE-2025-7974Same product: Rocket.Chat Rocket.Chat

Affected Assets

rocket.chat
rocket.chat
3.11.0, 3.12.0, 3.13.0

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input sanitization to block special-element injection.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing catches injection vulnerabilities but does not itself implement the sanitization fix.

A.8.15 Logging partial match
finds

Logging can record injection attempts for detection but does not prevent the weakness.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and sanitization practices that directly prevent special-element injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection flaws including special-element handling.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce injection surfaces but do not prescribe the actual sanitization logic.

A.8.28 Secure coding partial match
prevents

Secure coding standards require rigorous input sanitization, directly eliminating CWE-75.

References