CVE-2012-4930 json
The SPDY protocol 3 and earlier, as used in Mozilla Firefox, Google Chrome, and other products, can perform TLS encryption of compressed da…
published 2012-09-15 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4855
- cvss
- 2.6
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- google chrome 33
- mozilla firefox 40
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2012-4930 updated cvss 4.3
SPDY: SSL/TLS CRIME attack
-
Red Hat Enterprise Linux 5 firefox Red Hat Enterprise Linux 6 firefoxnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 2.6 | AV:N/AC:H/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-310 Cryptographic Issues
- Technology feeds
References
-
lists.opensuse.org
/opensuse-security-announce/2012-10/msg00010.html
vendor-advisory
- iacr.org /cryptodb/data/paper.php?pubkey=3091
- threatpost.com /en_us/blogs/crime-attack-uses-compression-ratio-tls-requests-side-channel-hijack-secure-sessions-091312
- isecpartners.com /blog/2012/9/14/details-on-the-crime-attack.html
- community.qualys.com /blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls
- theregister.co.uk /2012/09/14/crime_tls_attack/
- bugzilla.redhat.com /show_bug.cgi?id=857737
- arstechnica.com /security/2012/09/crime-hijacks-https-sessions/
- ekoparty.org /2012/thai-duong.php
Sources
- CVE List CVE-2012-4930
- NVD CVE-2012-4930
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Should not be reported for modern Chrome or Firefox versions, picking sufficiently old fix versions for now.