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Vulnerability record · CVE-2011-1428 · published 16 March 2011

CVE-2011-1428: Flashtux weechat improper input validation vulnerability

Flashtux · Weechat

Wee Enhanced Environment for Chat (aka WeeChat) 0.3.4 and earlier does not properly verify that the server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the-middle attackers to spoof an SSL chat server via an arbitrary certificate, related to incorrect use of the GnuTLS API.

5.8 CVSS 2.0 Medium EPSS 1.1% · top 36.2% CWE-20 · Improper input validation
5.8CVSS 2.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Wee Enhanced Environment for Chat (aka WeeChat) 0.3.4 and earlier does not properly verify that the server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the-middle attackers to spoof an SSL chat server via an arbitrary certificate, related to incorrect use of the GnuTLS API.

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

Affected products

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

References

LinkTags
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0671.html Exploit
http://git.savannah.gnu.org/gitweb/?p=weechat.git%3Ba=commit%3Bh=c265cad1c95b84abfd4e8d861f25926ef13b5d91
http://savannah.nongnu.org/patch/index.php?7459 ExploitPatch
http://secunia.com/advisories/43543 Vendor Advisory
http://www.securityfocus.com/bid/46612
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0671.html Exploit
http://git.savannah.gnu.org/gitweb/?p=weechat.git%3Ba=commit%3Bh=c265cad1c95b84abfd4e8d861f25926ef13b5d91
http://savannah.nongnu.org/patch/index.php?7459 ExploitPatch
http://secunia.com/advisories/43543 Vendor Advisory
http://www.securityfocus.com/bid/46612

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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-2011-1428), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.