Out-of-bounds Read in Libssh2
CVE-2025-15661
libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory conten…
Vulnerability class: Buffer Overflow
EPSS: 0.010 (60.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H.
Affected products
- Libssh2 — versions 0, 2dae3024897e1898d389835151f4e9606227721d
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking, technical-description, Patch)
- disclosure@vulncheck.com (issue-tracking, Patch)
- disclosure@vulncheck.com (Patch, patch)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-15661?
- CVE-2025-15661 is a medium-severity vulnerability in Libssh2, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-18.
- How severe is CVE-2025-15661?
- Medium severity. CVSS v3 base score is 6.5 out of 10.