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Vulnerability record · public intelligence
CVE-2012-0840
UNKNOWN

CVE-2012-0840

Published Feb 10, 2012 · Updated Oct 23, 2026

Severity · CVSSUNKNOWN · 5.0
Known exploitationNot listed
EPSS / likelihood42.14%
QFinch risk score25 / 100

Original summary

Normalized public record · Updated Oct 23, 2026

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.

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

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.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

CVENVDEPSSEXPLOITDB
SSVC priority
LOW
Confidence
25%
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. [apr-commits] 20120115 svn commit: r1231605 - /apr/apr/trunk/tables/apr_hash.c ↗
  2. apacheapr-hash-dos(73096) ↗
  3. [oss-security] 20120208 CVE request: apr - Hash DoS vulnerability ↗
  4. MDVSA-2012:019 ↗
  5. 47862 ↗
  6. svn.apache.org ↗
  7. [dev] 20120105 Hash collision vectors in APR? ↗
  8. [dev] 20120113 Re: Hash collision vectors in APR? ↗
  9. [oss-security] 20120208 Re: CVE request: apr - Hash DoS vulnerability ↗
  10. [dev] 20120114 Re: Hash collision vectors in APR? ↗

Record history

Published Feb 10, 2012 · Last refreshed Oct 23, 2026

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