Cyber Resilience

CVE-2021-26955

CriticalPublic PoC

Published: 09 February 2021

Published
09 February 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0050 66.6th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26955 is a critical-severity Unchecked Return Value (CWE-252) vulnerability in Xcb Project Xcb. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 33.4% 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 details

An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because xcb::xproto::GetAtomNameReply::name() calls std::str::from_utf8_unchecked() on unvalidated bytes from an X server.

CWE(s)
CWE-252

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

xcb project
xcb
≤ 2021-02-04

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References