CVE-2009-3555: Apache HTTP Server

Critical severity, CVSS 9.8. EPSS: 87.3% chance of exploitation in the next 30 days.

The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL, by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context, related to a "plaintext injection" attack, aka the "Project Mogul" issue.

Affected products

• Apache HTTP Server: up to and including 2.2.14
• Canonical Ubuntu Linux: version 8.04 only; version 8.10 only; version 9.04 only; version 9.10 only; version 10.04 only; version 10.10 only
• Debian Debian Linux: version 4.0 only; version 5.0 only; version 6.0 only; version 7.0 only; version 8.0 only
• F5 Nginx: from 0.1.0, up to and including 0.8.22
• Fedoraproject Fedora: version 11 only; version 12 only; version 13 only; version 14 only
• GNU Gnutls: up to and including 2.8.5
• Mozilla Nss: up to and including 3.12.4
• OpenSSL OpenSSL: up to and including 0.9.8k; version 1.0 only

Published 2009-11-09. Last modified 2026-06-16.