Is there a public exploit for CVE-2025-15661?

No public exploit for CVE-2025-15661 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2025-15661?

CVE-2025-15661 scores CVSS 8.3 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.65%.

What does CVE-2025-15661 affect?

CVE-2025-15661 affects libssh2 libssh2.

8.3 High

libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftpsymlink() function in…

CVE-2025-15661

libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftpsymlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSHFXPNAME response. Attackers can supply a linklen value larger than the actual packet data in SSHFXPNAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to targetlen minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.

Assessment

CVSS: 8.3 (v4.0)
Severity: High
EPSS: 0.65% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 18 June 2026
Last updated: 10 November 2026
Affected: libssh2 · libssh2
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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