[UPDATE] [hoch] libxml2: Mehrere Schwachstellen ermöglichen Denial of Service

highCVE-2025-49794 CVE-2025-49795 CVE-2025-49796 CVE-2025-6021

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in libxml2 ausnutzen, um einen Denial of Service Angriff durchzuführen oder nicht näher beschriebene Auswirkungen zu erzielen.

CSIRTS triage

vendor: libxml2 product: libxml2 Denial of serviceOther

What: Multiple vulnerabilities allow remote attackers to cause denial-of-service or achieve unspecified impact through XML processing.
Who is affected: Applications and systems using affected versions of libxml2 library.
Urgency: High priority; remote attack vector and potential for unspecified impact.
Action: Update libxml2 to a patched version addressing CVE-2025-49794, CVE-2025-49795, CVE-2025-49796, and CVE-2025-6021.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-09-10
Exploitation: Not in CISA KEV at last sync

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-1312

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.

Low exploitation riskCVE-2025-497940.78% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
Low exploitation riskCVE-2025-497950.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2025-497961.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 73% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2025-60211.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 70% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-49794	coverage & exploitation status	NVD · CVE.org
CVE-2025-49795	coverage & exploitation status	NVD · CVE.org
CVE-2025-49796	coverage & exploitation status	NVD · CVE.org
CVE-2025-6021	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [mittel] Oracle Java SE: Mehrere Schwachstellencert-bund
criticalexploited[UPDATE] [critical] Oracle Fusion Middleware: Multiple Vulnerabilitiescert-bund
high[UPDATE] [high] Dell PowerProtect Data Domain OS: Multiple vulnerabilitiescert-bund
high[NEW] [high] Dell PowerProtect Data Domain: Multiple vulnerabilitiescert-bund
criticalSiemens SINEC OScisa