[UPDATE] [medium] GNU libc: Multiple vulnerabilities
A remote, anonymous attacker can exploit multiple vulnerabilities in GNU libc to conduct a denial of service attack.
CSIRTS triage
- What
- Multiple vulnerabilities in GNU libc enable remote denial of service attacks.
- Who is affected
- Systems with affected GNU libc versions.
- Urgency
- Medium severity DoS vulnerabilities require standard patching cycle; not exploited.
- Action
- Apply updates to GNU libc.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-2384
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Moderate exploitation riskCVE-2023-45271.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 73% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2023-48061.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 72% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2023-4527 | coverage & exploitation status | NVD · CVE.org |
| CVE-2023-4806 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for GNU libc
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- medium[UPDATE] [mittel] GNU libc: Mehrere Schwachstellencert-bund · 2026-09-11
- critical[UPDATE] [kritisch] GNU libc: Mehrere Schwachstellencert-bund · 2026-09-11
- medium[UPDATE] [mittel] GNU libc: Schwachstelle ermöglicht Denial of Servicecert-bund · 2026-09-11
- medium[UPDATE] [mittel] GNU libc: Mehrere Schwachstellen ermöglichen Manipulation von DNS Antwortencert-bund · 2026-09-11
- low[NEU] [UNGEPATCHT] [niedrig] GNU libc: Schwachstelle ermöglicht Denial of Servicecert-bund · 2026-09-11
- medium[UPDATE] [mittel] GNU libc: Schwachstelle ermöglicht Denial of Servicecert-bund · 2026-09-11
More from CERT-Bund (BSI) Security Advisories
- high[UPDATE] [hoch] Red Hat Enterprise Linux (postgis, virtuoso-opensource): Mehrere Schwachstellen2026-09-11
- medium[UPDATE] [mittel] Red Hat Enterprise Linux: Mehrere Schwachstellen2026-09-11
- medium[UPDATE] [mittel] Linux Kernel: Schwachstelle ermöglicht Denial of Service2026-09-11
- medium[UPDATE] [mittel] Linux Kernel: Mehrere Schwachstellen2026-09-11
- high[UPDATE] [hoch] OpenSSL: Mehrere Schwachstellen2026-09-11