Description

Hydra through 9.7, fixed in commit 9cc84c2, contains a stack buffer overflow in NTLM authentication across SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A malicious server can send a crafted NTLM Type-2 challenge with an excessively long domain string, causing base64-encoded response data to overflow a 500-byte stack buffer by 18 to 330 bytes, enabling remote code execution on systems without stack protection.

Severity (CVSS)

Base score8.6
SeverityHigh
VersionCVSS 4.0
VectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Provided byCNA

Weaknesses

  • CWE-121 — Stack-based Buffer Overflow

Affected products

VendorProductVersions
vanhauser-thcthc-hydra0 to <=9.7; 9cc84c20e75f5fef6bb1790bb9ada2afad2204e2

References

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 26 Jun 2026 07:05 UTC.