CVE-2025-15661
A remote, anonymous attacker can exploit a vulnerability in libssh2 to perform a Denial of Service attack or disclose information.
CSIRTS triage
- What
- libssh2 contains a vulnerability allowing remote denial of service and information disclosure.
- Who is affected
- All deployments of libssh2 are affected.
- Urgency
- Medium priority; not currently exploited but affects availability and confidentiality.
- Action
- Update libssh2 to a patched version when available.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2025-15661
Get an email if CVE-2025-15661 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Moderate exploitation risk1.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.
Advisory coverage (4)
- medium[UPDATE] [medium] libssh2: Vulnerability allows Denial of Service and disclosure of informationcert-bund · 2026-08-25
- unknownMultiple vulnerabilities in Microsoft Azure Linux (July 7, 2026)cert-fr-avis · 2026-07-07
- unknownDSA-6365-1 libssh2 - security updatedebian · 2026-06-25
- mediumCVE-2025-15661: libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.cmsrc · 2026-06-09
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2025-15661)