java: hash table collisions CPU usage DoS (oCERT-2011-003)
Published Nov 28, 2012
5.0
MEDIUMCVSS 2.0
EPSS 3.17%
Description
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.
Affected products
No data.
Configuration 1
- ≤ 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
- ≤ 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
- 1.7.0
No data.
Red Hat Enterprise Linux 4
java-1.5.0-ibm
Will not fix
Red Hat Enterprise Linux 4
java-1.6.0-ibm
Will not fix
Red Hat Enterprise Linux 4
java-1.6.0-sun
Will not fix
Red Hat Enterprise Linux 5
java-1.5.0-ibm
Will not fix
Red Hat Enterprise Linux 5
java-1.6.0-ibm
Will not fix
Red Hat Enterprise Linux 5
java-1.6.0-openjdk
Will not fix
Red Hat Enterprise Linux 5
java-1.6.0-sun
Will not fix
Red Hat Enterprise Linux 6
java-1.5.0-ibm
Will not fix
Red Hat Enterprise Linux 6
java-1.6.0-ibm
Will not fix
Red Hat Enterprise Linux 6
java-1.6.0-openjdk
Will not fix
Red Hat Enterprise Linux 6
java-1.6.0-sun
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | java-1.5.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 4 | java-1.6.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 4 | java-1.6.0-sun | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | java-1.5.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | java-1.6.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | java-1.6.0-openjdk | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | java-1.6.0-sun | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | java-1.5.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | java-1.6.0-ibm | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | java-1.6.0-openjdk | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | java-1.6.0-sun | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw affects various versions of Java as shipped with Red Hat products. A patch is available for Java 7 and Java 8, but not for previous versions of Java shipped with Red Hat products. Although no patch is available for previous versions of Java as shipped with Red Hat products, the impact of this flaw has been addressed in several components that utilize Java HashMap in such a way that may expose a denial of service flaw.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.17% (0.03170) | 87.60th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.17% (0.03170) | 86.32th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.04% (0.01045) | 75.96th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00270) | 68.70th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.27% (0.00270) | 66.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00270) | 62.65th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.10% (0.01104) | 54.09th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.10% (0.01104) | 52.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.10% (0.01104) | 50.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.10% (0.01104) | 28.85th | v2 (v2022.01.01) |
References (11)
- http://armoredbarista.blogspot.de/2012/02/investigating-hashdos-issue.html x_refsource_MISCExploit
- http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010238.html mailing-listx_refsource_MLISTVendor Advisory
- http://www.kb.cert.org/vuls/id/903934 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.nruns.com/_downloads/advisory28122011.pdf x_refsource_MISC
- http://www.ocert.org/advisories/ocert-2011-003.html x_refsource_MISC
- http://www.openwall.com/lists/oss-security/2012/06/15/12 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2012/06/17/1 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2012-2739 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=750533 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2012-2739
- https://www.cve.org/CVERecord?id=CVE-2012-2739
| Link | Providers | Tags |
|---|---|---|
| http://armoredbarista.blogspot.de/2012/02/investigating-hashdos-issue.html | x_refsource_MISCExploit | |
| http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010238.html | mailing-listx_refsource_MLISTVendor Advisory | |
| http://www.kb.cert.org/vuls/id/903934 | third-party-advisoryx_refsource_CERT-VNUS Government Resource | |
| http://www.nruns.com/_downloads/advisory28122011.pdf | x_refsource_MISC | |
| http://www.ocert.org/advisories/ocert-2011-003.html | x_refsource_MISC | |
| http://www.openwall.com/lists/oss-security/2012/06/15/12 | mailing-listx_refsource_MLIST | |
| http://www.openwall.com/lists/oss-security/2012/06/17/1 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2012-2739 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=750533 | x_refsource_CONFIRMIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2012-2739 | ||
| https://www.cve.org/CVERecord?id=CVE-2012-2739 |
Change history (0)
No recorded changes yet.