Dashboard / CVE-2025-15661

CVE-2025-15661

HIGH
MEDIUM Priority: 0.05 BB Relevance: 77/100
Published: 2026-06-18 Modified: 2026-11-10 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: X
AT: None
VC: Low
VI: None
VA: High

Description

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 contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.

Weakness Classification (1)

Affected Software (3)

VendorProductVersion
libssh2 libssh2 0
libssh2 libssh2 0
libssh2 libssh2 < 1.11.1

References & Advisories (5)

Bug Bounty Relevance

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.65%
Raw Score 0.006480
Percentile 51.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00648
2026-11-12
0.00648
2026-11-10
0.00648
2026-11-09
0.00648
2026-11-08
0.00648

Intelligence Sources

mitre ref →
nvd ref →

External Links