What’s Vulnerable › Vulnerabilities

CVE-2012-4930

• Severity: low (CVSS 2.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-09-15 · updated 2026-06-16
• Weakness: CWE-310

Description

The SPDY protocol 3 and earlier, as used in Mozilla Firefox, Google Chrome, and other products, can perform TLS encryption of compressed data without properly obfuscating the length of the unencrypted data, which allows man-in-the-middle attackers to obtain plaintext HTTP headers by observing length differences during a series of guesses in which a string in an HTTP request potentially matches an unknown string in an HTTP header, aka a "CRIME" attack.

Affected products

• Google Chrome: all versions
• Mozilla Firefox: all versions

References

• http://arstechnica.com/security/2012/09/crime-hijacks-https-sessions/
• http://isecpartners.com/blog/2012/9/14/details-on-the-crime-attack.html
• http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html
• http://threatpost.com/en_us/blogs/crime-attack-uses-compression-ratio-tls-requests-side-channel-hijack-secure-sessions-091312
• http://www.ekoparty.org/2012/thai-duong.php
• http://www.iacr.org/cryptodb/data/paper.php?pubkey=3091
• http://www.theregister.co.uk/2012/09/14/crime_tls_attack/
• https://bugzilla.redhat.com/show_bug.cgi?id=857737
• https://community.qualys.com/blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls
• http://arstechnica.com/security/2012/09/crime-hijacks-https-sessions/
• http://isecpartners.com/blog/2012/9/14/details-on-the-crime-attack.html
• http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html

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