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Vulnerability record · CVE-2008-0555 · published 4 April 2008

CVE-2008-0555: Apache-ssl improper input validation vulnerability

Apache Ssl · Apache Ssl

The ExpandCert function in Apache-SSL before apache_1.3.41+ssl_1.59 does not properly handle (1) '/' and (2) '=' characters in a Distinguished Name (DN) in a client certificate, which might allow remote attackers to bypass authentication via a crafted DN that triggers overwriting of environment variables.

7.5 CVSS 2.0 High EPSS 1.9% · top 21.5% CWE-20 · Improper input validationCWE-287 · Improper authentication
7.5CVSS 2.0 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References, 6 tagged exploit
16 Jun 2026Last modified by NVD

Description

The ExpandCert function in Apache-SSL before apache_1.3.41+ssl_1.59 does not properly handle (1) '/' and (2) '=' characters in a Distinguished Name (DN) in a client certificate, which might allow remote attackers to bypass authentication via a crafted DN that triggers overwriting of environment variables.

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

Affected products

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

References

LinkTags
http://secunia.com/advisories/29644 Vendor Advisory
http://securityreason.com/securityalert/3797
http://www.apache-ssl.org/advisory-cve-2008-0555.txt Exploit
http://www.cynops.de/advisories/CVE-2008-0555.txt Exploit
http://www.klink.name/security/aklink-sa-2008-005-apache-ssl.txt Exploit
http://www.securityfocus.com/archive/1/490386/100/0/threaded
http://www.securityfocus.com/bid/28576 Patch
http://www.securitytracker.com/id?1019784
http://www.vupen.com/english/advisories/2008/1079/references
https://exchange.xforce.ibmcloud.com/vulnerabilities/41618
http://secunia.com/advisories/29644 Vendor Advisory
http://securityreason.com/securityalert/3797
http://www.apache-ssl.org/advisory-cve-2008-0555.txt Exploit
http://www.cynops.de/advisories/CVE-2008-0555.txt Exploit
http://www.klink.name/security/aklink-sa-2008-005-apache-ssl.txt Exploit
http://www.securityfocus.com/archive/1/490386/100/0/threaded
http://www.securityfocus.com/bid/28576 Patch
http://www.securitytracker.com/id?1019784
http://www.vupen.com/english/advisories/2008/1079/references
https://exchange.xforce.ibmcloud.com/vulnerabilities/41618

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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-2008-0555), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.