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Vulnerability record · CVE-2012-0840 · published 10 February 2012

CVE-2012-0840: Apache portable runtime improper input validation vulnerability

Apache · Portable Runtime

tables/apr_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 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.

5.0 CVSS 2.0 Medium EPSS 42% · top 1.3% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

tables/apr_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 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.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://mail-archives.apache.org/mod_mbox/apr-commits/201201.mbox/%3C20120115003715.071D423888FD%40eris.apache.org%3E
http://openwall.com/lists/oss-security/2012/02/08/3
http://openwall.com/lists/oss-security/2012/02/09/1
http://secunia.com/advisories/47862 Vendor Advisory
http://svn.apache.org/viewvc?rev=1231605&view=rev Patch
http://www.mail-archive.com/dev%40apr.apache.org/msg24439.html
http://www.mail-archive.com/dev%40apr.apache.org/msg24472.html
http://www.mail-archive.com/dev%40apr.apache.org/msg24473.html
http://www.mandriva.com/security/advisories?name=MDVSA-2012:019
https://exchange.xforce.ibmcloud.com/vulnerabilities/73096
http://mail-archives.apache.org/mod_mbox/apr-commits/201201.mbox/%3C20120115003715.071D423888FD%40eris.apache.org%3E
http://openwall.com/lists/oss-security/2012/02/08/3
http://openwall.com/lists/oss-security/2012/02/09/1
http://secunia.com/advisories/47862 Vendor Advisory
http://svn.apache.org/viewvc?rev=1231605&view=rev Patch
http://www.mail-archive.com/dev%40apr.apache.org/msg24439.html
http://www.mail-archive.com/dev%40apr.apache.org/msg24472.html
http://www.mail-archive.com/dev%40apr.apache.org/msg24473.html
http://www.mandriva.com/security/advisories?name=MDVSA-2012:019
https://exchange.xforce.ibmcloud.com/vulnerabilities/73096

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2012-0840), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.