CVE-2012-2739 json
Oracle Java SE before 7 Update 6, and OpenJDK 7 before 7u6 build 12 and 8 before build 39, computes hash values without restricting the abi…
published 2012-11-28 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-2719
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.2%
- EPSS 3.2% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
Oracle Java SE before 7 Update 6, and OpenJDK 7 before 7u6 build 12 and 8 before build 39, computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.
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-2012-2739 updated cvss 5.0
java: hash table collisions CPU usage DoS (oCERT-2011-003)
-
Red Hat Enterprise Linux 4 java-1.5.0-ibm, java-1.6.0-ibm, java-1.6.0-sun, java-1.6.0-sun-src, java-1.6.0-sun-demo, java-1.6.0-sun-jdbc, +2 more Red Hat Enterprise Linux 5 java-1.5.0-ibm, java-1.6.0-ibm, java-1.6.0-sun, java-1.6.0-openjdk, java-1.6.0-sun-src, java-1.6.0-sun-demo, +3 more Red Hat Enterprise Linux 6 java-1.5.0-ibm, java-1.6.0-ibm, java-1.6.0-sun, java-1.5.0-ibm-src, java-1.6.0-ibm-src, java-1.6.0-openjdk, +15 moreaffected: no fix planned “Will not fix”
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
3.17% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- armoredbarista.blogspot.de http://armoredbarista.blogspot.de/2012/02/investigating-hashdos-issue.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-310 Cryptographic Issues
References
-
armoredbarista.blogspot.de
/2012/02/investigating-hashdos-issue.html
exploit
-
mail.openjdk.java.net
/pipermail/core-libs-dev/2012-May/010238.html
mailing-list, vendor-advisory
- nruns.com /_downloads/advisory28122011.pdf
- bugzilla.redhat.com /show_bug.cgi?id=750533
-
openwall.com
/lists/oss-security/2012/06/17/1
mailing-list
-
kb.cert.org
/vuls/id/903934
third-party-advisory, us-government-resource
-
openwall.com
/lists/oss-security/2012/06/15/12
mailing-list
- ocert.org /advisories/ocert-2011-003.html
Sources
- CVE List CVE-2012-2739
- NVD CVE-2012-2739
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.