CVE-2021-35942

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
84.2%
KEV
Not listed

Published

July 22, 2021

Last Modified

February 13, 2026

Advisory Details (5)

Auto-updated Jul 21, 2026
Patch available.
generic

28011 – (CVE-2021-35942) Wild read in wordexp (parse_param) (CVE-2021-35942)

https://sourceware.org/bugzilla/show_bug.cgi?id=28011
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210827-0005/
generic

GNU C Library: Multiple Vulnerabilities (GLSA 202208-24) — Gentoo security

https://security.gentoo.org/glsa/202208-24
generic Patch Available

[SECURITY] [DLA 3152-1] glibc security update

https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
generic

Security Exceptions - glibc wiki

https://sourceware.org/glibc/wiki/Security%20Exceptions

Vendor Advisories for CVE-2021-35942(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulocales (2.23-0ubuntu11.3+esm2) @ xenial2026-05-26ubuntu
ubuntulibc6-prof (2.31-0ubuntu9.7) @ focal2026-05-26ubuntu
redhatglibc-0:2.28-164.el82021-11-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-23 02:02 UTCEG score recompute
  2. 2026-07-22 22:49 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  72. 2026-05-26 13:06 UTCVendor advisory
  73. 2026-05-26 13:06 UTCGHSA enrichment
  74. 2026-05-26 07:17 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-35942?
CVE-2021-35942 is a critical vulnerability published on July 22, 2021. The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but…
When was CVE-2021-35942 disclosed?
CVE-2021-35942 was first published in the National Vulnerability Database on July 22, 2021, with the most recent update on February 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-35942 actively exploited?
CVE-2021-35942 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-35942?
CVE-2021-35942 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-35942?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35942, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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