CVE-2009-4488
Varnish 2.0.6 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. NOTE: the vendor disputes the significance of this report, stating that "This is not a security problem in Varnish or any other piece of software which writes a logfile. The real problem is the mistaken belief that you can cat(1) a random logfile to your terminal safely.
Key facts
- CVSS score
- 9.8 (v3.1)
- Severity
- CRITICAL
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
- CWE-20
- EPSS score
- 13.0% (96th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2009-4455)
- Published
- January 13, 2010
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2009-4455 in the EU Vulnerability Database. Last updated in EUVD on January 21, 2025.
View on the EU Vulnerability DatabaseAffected products
- varnish.projects.linpro / varnish
References
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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