Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2009-4491

41
FAUCET Score

CVE-2009-4491 describes a critical vulnerability in thttpd 2.25b0 where unsanitized non-printable characters written to log files can be exploited. This allows remote attackers to manipulate terminal emulator escape sequences via HTTP requests, potentially leading to window title modification, arbitrary command execution, or file overwrites. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity and no user interaction, posing a high risk to confidentiality, integrity, and availability. While not listed in CISA KEV, an ExploitDB entry exists (EDB-33499), indicating public exploit code, though there is minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.25CPE matchmatch criteria
cpe:2.3:a:acme:thttpd:2.25:b:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
13.47%
Probability of exploitation in next 30 days
EPSS Percentile
96.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-33499 · Jan 11, 2010
This CVE's current EPSS score of 0.1347 is in the 92nd percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/175949/m-privacy-TightGate-Pro-Code-Execution-Insecure-Permissions.html
seclists.org / fulldisclosure/2023/Nov/13
securityfocus.com / archive/1/508830/100/0/threaded
ush.it / team/ush/hack_httpd_escape/adv.txt
Exploit