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Vulnerability record · CVE-2009-4488 · published 13 January 2010

CVE-2009-4488: Varnish.projects.linpro varnish improper input validation vulnerability

VVarnish.Projects.Linpro · Varnish

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.

9.8 CVSS 3.1 Critical EPSS 13% · top 3.8% CWE-20 · Improper input validationCWE-1284 · CWE-1284
9.8CVSS 3.1 base score, v2 5.0
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/508830/100/0/threaded
http://www.securityfocus.com/bid/37713 Exploit
http://www.ush.it/team/ush/hack_httpd_escape/adv.txt Exploit
http://www.securityfocus.com/archive/1/508830/100/0/threaded
http://www.securityfocus.com/bid/37713 Exploit
http://www.ush.it/team/ush/hack_httpd_escape/adv.txt Exploit

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-4488), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.