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
Noroxi assessment
Priority: Monitor (action score 29/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 12% (FIRST EPSS); higher than 96% of all records.
- No special conditions are required; it is repeatable.
- Fixed version: apr-util (Debian:12) 1.3.7+dfsg-1; apache2 (openSUSE:Tumbleweed) 2.4.23-4.1; httpd (Red Hat:enterprise_linux:3::as) 0:2.0.46-73.ent.
Low priority for now. Upgrade to apr-util (Debian:12) 1.3.7+dfsg-1; apache2 (openSUSE:Tumbleweed) 2.4.23-4.1; httpd (Red Hat:enterprise_linux:3::as) 0:2.0.46-73.ent or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
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.
- Published
- Jun 7, 2009
- Updated
- Jun 16, 2026
- EPSS
- 12.0% · 96th percentile
- CWE
- CWE-189
Report tools
Action score
29
Monitor
Low priority for now.
- CVSS
- 25 / 40 · 6.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 12.0%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| apache | apr-util | cpe:2.3:a:apache:apr-util |
| apache | http server | cpe:2.3:a:apache:http_server |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache http server2.2.0 and later · before 2.2.12
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | apr-util | before 1.3.7+dfsg-1 | 1.3.7+dfsg-1 |
| openSUSE:Tumbleweed | apache2 | before 2.4.23-4.1 | 2.4.23-4.1 |
| Red Hat:enterprise_linux:3::as | httpd | before 0:2.0.46-73.ent | 0:2.0.46-73.ent |
| Red Hat:enterprise_linux:3::as | httpd-debuginfo | before 0:2.0.46-73.ent | 0:2.0.46-73.ent |
| Red Hat:enterprise_linux:3::as | httpd-devel | before 0:2.0.46-73.ent | 0:2.0.46-73.ent |
| Red Hat:enterprise_linux:3::as | mod_ssl | before 1:2.0.46-73.ent | 1:2.0.46-73.ent |
| Red Hat:enterprise_linux:4::as | apr-util | before 0:0.9.4-22.el4_8.1 | 0:0.9.4-22.el4_8.1 |
| Red Hat:enterprise_linux:4::as | apr-util-debuginfo | before 0:0.9.4-22.el4_8.1 | 0:0.9.4-22.el4_8.1 |
| Red Hat:enterprise_linux:4::as | apr-util-devel | before 0:0.9.4-22.el4_8.1 | 0:0.9.4-22.el4_8.1 |
| Red Hat:enterprise_linux:5::client | apr-util-docs | before 0:1.2.7-7.el5_3.1 | 0:1.2.7-7.el5_3.1 |
| Red Hat:enterprise_linux:5::client_workstation | apr-util | before 0:1.2.7-7.el5_3.1 | 0:1.2.7-7.el5_3.1 |
| Red Hat:enterprise_linux:5::client_workstation | apr-util-debuginfo | before 0:1.2.7-7.el5_3.1 | 0:1.2.7-7.el5_3.1 |
| Red Hat:enterprise_linux:5::client_workstation | apr-util-devel | before 0:1.2.7-7.el5_3.1 | 0:1.2.7-7.el5_3.1 |
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2009-1955The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn mod46Plan
- CVE-2009-2412Multiple integer overflows in the Apache Portable Runtime (APR) library and the Apache Portable Utility library (aka APR-util) 0.9.x and 1.344Plan
- CVE-2026-34191Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle36Monitor
- CVE-2026-32327Apache Portable Runtime Utility: apr-util XML stack recursion crash36Monitor
- CVE-2025-49506Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack30Monitor
- CVE-2026-34502Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:apr-util | 1.3.7+dfsg-1 · Debian:12 | Package registry (OSV) |
| opensuse:apache2 | 2.4.23-4.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:apr-util | 0:0.9.4-22.el4_8.1 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
| red hat:apr-util-debuginfo | 0:0.9.4-22.el4_8.1 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
| red hat:apr-util-devel | 0:0.9.4-22.el4_8.1 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
| red hat:apr-util-docs | 0:1.2.7-7.el5_3.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:httpd | 0:2.0.46-73.ent · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
| red hat:httpd-debuginfo | 0:2.0.46-73.ent · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
| red hat:httpd-devel | 0:2.0.46-73.ent · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
| red hat:mod_ssl | 1:2.0.46-73.ent · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-189 · Numeric ErrorsCVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- marc.info/?l=bugtraq&m=129190899612998&w=2
- secunia.com/advisories/34724
- secunia.com/advisories/35284
- secunia.com/advisories/35395
- secunia.com/advisories/35487
- secunia.com/advisories/35565
- secunia.com/advisories/35710
- secunia.com/advisories/35797
- secunia.com/advisories/35843
- secunia.com/advisories/37221
- security.gentoo.org/glsa/glsa-200907-03.xml
- support.apple.com/kb/HT3937
- svn.apache.org/viewvc?view=rev&revision=768417
- www-01.ibm.com/support/docview.wss?uid=swg1PK88341
- www-01.ibm.com/support/docview.wss?uid=swg1PK91241
- www-01.ibm.com/support/docview.wss?uid=swg1PK99478
- www-01.ibm.com/support/docview.wss?uid=swg27014463
- www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
- www.mail-archive.com/dev%40apr.apache.org/msg21591.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.