GNU C Library
Auto-added after CISA flagged GNU C Library as actively exploited (KEV catalog). Version and lifecycle mapping is pending review, so this is assessed at the product level and is never reported as a confident "healthy".
Known exploited vulnerability
CISA's Known Exploited Vulnerabilities (KEV) catalog flagged GNU C Library (GNU) as exploited in the wild — that's why IsItPatched started tracking it. The vulnerability that triggered it:
CVE-2023-4911 ↗ view on NVD
Per-version vulnerability and lifecycle data for GNU C Library is still being mapped, so no health score is shown yet. Treat it as urgent: identify the exact version you run and confirm it against GNU's advisory, then move to a patched, supported release.
Summary iPlain-English security verdict for GNU C Library, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
GNU C Library is on CISA's Known Exploited Vulnerabilities (KEV) catalog — it was confirmed under active attack in the wild, which is why CVE-2023-4911 led IsItPatched to start tracking GNU's GNU C Library. Its per-version vulnerability and lifecycle data is still being mapped, so no health score is shown yet. Treat GNU C Library as urgent: identify the exact version you run and confirm it against GNU's security advisory, then move to a patched, supported release.
Disclosure trend iNew CVEs published for GNU C Library each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
No urgent unpatched issues identified. ✓
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Frequently asked
Is GNU C Library safe and patched?
GNU C Library is on CISA's Known Exploited Vulnerabilities (KEV) catalog — it was confirmed under active attack in the wild, which is why CVE-2023-4911 led IsItPatched to start tracking GNU's GNU C Library. Its per-version vulnerability and lifecycle data is still being mapped, so no health score is shown yet. Treat GNU C Library as urgent: identify the exact version you run and confirm it against GNU's security advisory, then move to a patched, supported release.
What should I do about GNU C Library now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against GNU's official advisory.
Why is GNU C Library listed on IsItPatched?
GNU C Library was added automatically because CISA's Known Exploited Vulnerabilities (KEV) catalog flagged it as actively exploited in the wild. IsItPatched tracks its known CVEs, severity (CVSS), exploitation probability (EPSS) and KEV status from public data; its version and lifecycle mapping is verified over time.
Has GNU C Library been actively exploited?
Yes. CISA added GNU C Library to its Known Exploited Vulnerabilities (KEV) catalog after confirming exploitation in the wild — the triggering vulnerability is CVE-2023-4911. Make sure you are running a patched, supported version of GNU C Library and confirm it against GNU's security advisory.
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against GNU's official advisory before you patch or upgrade.