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Fencer Vulns
medium 6.4

CVE-2009-1956 json

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 obt…

published 2009-06-06 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1951

cvss
6.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
12.0%
EPSS 12.0% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Patch / fix

  • apache http_server 2.2.12
  • apr-util Debian 14, Debian 13, Debian 12 1.3.7+dfsg-1

debian advisories DEBIAN-CVE-2009-1956

  • ant certificate system 7.3 1.6.5-1jpp_1rh
  • axis certificate system 7.3 1.2.1-1jpp_3rh
  • mx4j certificate system 7.3 1:3.0.1-1jpp_4rh
  • log4j certificate system 7.3 1.2.12-1jpp_1rh
  • tomcat5 certificate system 7.3 5.5.23-0jpp_4rh.16
  • rhpki-ca certificate system 7.3 7.3.0-20.el4
  • pcsc-lite certificate system 7.3 1.3.3-3.el4
  • rhpki-kra certificate system 7.3 7.3.0-14.el4

red hat advisories RHSA-2010:0602RHSA-2009:1108RHSA-2009:1107

  • apache2 openSUSE Tumbleweed 2.4.23-4.1

opensuse advisories openSUSE-SU-2024:10268-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-1956 updated cvss 4.3

apr-util single NULL byte buffer overflow

  • Red Hat Certificate System 7.3 for 4AS ant 1.6.5-1jpp_1rh, axis 1.2.1-1jpp_3rh, mx4j 3.0.1-1jpp_4rh, log4j 1.2.12-1jpp_1rh, pcsc-lite 1.3.3-3.el4, rhpki-ca 7.3.0-20.el4, +31 more Red Hat Certificate System 7.3 for 4ES ant 1.6.5-1jpp_1rh, axis 1.2.1-1jpp_3rh, mx4j 3.0.1-1jpp_4rh, log4j 1.2.12-1jpp_1rh, pcsc-lite 1.3.3-3.el4, rhpki-ca 7.3.0-20.el4, +31 more
    fixed: vendor fix RHSA-2010:0602
  • Red Hat Desktop version 3 httpd 2.0.46-73.ent, mod_ssl 2.0.46-73.ent
    fixed: vendor fix RHSA-2009:1108
  • Red Hat Enterprise Linux (v. 5 server) apr-util 1.2.7-7.el5_3.1
    fixed: vendor fix RHSA-2009:1107
  • Red Hat Enterprise Linux AS version 3 httpd 2.0.46-73.ent, mod_ssl 2.0.46-73.ent
    fixed: vendor fix RHSA-2009:1108
  • Red Hat Enterprise Linux AS version 4 apr-util 0.9.4-22.el4_8.1 Red Hat Enterprise Linux Desktop (v. 5 client) apr-util 1.2.7-7.el5_3.1 Red Hat Enterprise Linux Desktop version 4 apr-util 0.9.4-22.el4_8.1 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) apr-util 1.2.7-7.el5_3.1
    fixed: vendor fix RHSA-2009:1107
  • Red Hat Enterprise Linux ES version 3 httpd 2.0.46-73.ent, mod_ssl 2.0.46-73.ent
    fixed: vendor fix RHSA-2009:1108
  • Red Hat Enterprise Linux ES version 4 apr-util 0.9.4-22.el4_8.1
    fixed: vendor fix RHSA-2009:1107
  • Red Hat Enterprise Linux WS version 3 httpd 2.0.46-73.ent, mod_ssl 2.0.46-73.ent
    fixed: vendor fix RHSA-2009:1108
show 1 more
  • Red Hat Enterprise Linux WS version 4 apr-util 0.9.4-22.el4_8.1
    fixed: vendor fix RHSA-2009:1107

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

12.04% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2009/06/06/1 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=504390 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.