Curl < 7.19.6 Certificate Validation Bypass Vulnerability

Medium Nessus Network Monitor Plugin ID 5130


The remote host may be affected by a security bypass vulnerability.


The remote host is running Curl, a download client for various protocols. This version of Curl reportedly fails to properly validate the domain name in a signed CA certificate because the application stops reading the domain name when it encounters a NULL character. An attacker can exploit this by obtaining a legitimate certificate for a subdomain that contains a NULL character. This issue only affects Curl when it is compiled against OpenSSL.


Upgrade to Curl version 7.19.6

See Also

Plugin Details

Severity: Medium

ID: 5130

Family: Web Clients

Published: 2009/08/13

Modified: 2016/01/21

Dependencies: 1735, 8314

Risk Information

Risk Factor: Medium


Base Score: 6.4

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Temporal Vector: CVSS2#E:F/RL:OF/RC:C


Base Score: 6.5

Temporal Score: 6


Temporal Vector: CVSS3#E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:haxx:curl

Patch Publication Date: 2009/08/12

Vulnerability Publication Date: 2009/08/12

Reference Information

CVE: CVE-2009-2417

BID: 36032