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TI-2009-04252 Aliases CVE-2009-4491GHSA-hpcm-8c4f-v6x2

thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters…

Priority HIGH 82CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-94.

Summary

thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.13718 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:acme:thttpd:2.25:b:*:*:*:*:*:*2.25 bVulnerableACME
  • cpe:2.3:a:acme:thttpd:2.25:b:*:*:*:*:*:* Versions 2.25 b Vulnerable ·ACME

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-4491
  2. 2026-10-03 Alias added: GHSA-hpcm-8c4f-v6x2

References

Exploit 1

Other 2

  • TI-2003-00821 Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers… CVSS 3.1CRITICAL 9.8
  • TI-2001-01444 Off-by-one buffer overflow in Basic Authentication in Acme Labs thttpd 1.95 through 2.20… CVSS 3.1CRITICAL 9.8
  • TI-2017-12928 The htpasswd implementation of mini_httpd before v1.28 and of thttpd before v2.28 is… CVSS 3.0CRITICAL 9.8
  • TI-2007-00153 thttpd 2007 has buffer underflow. CVSS 3.1CRITICAL 9.8
  • TI-2001-00849 Acme Thttpd Secure Webserver before 2.22, with the chroot option enabled, allows remote… CVSS 2.0MEDIUM 5.0
  • TI-2012-04741 thttpd has a local DoS vulnerability via specially-crafted .htpasswd files CVSS 3.1MEDIUM 5.5
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences