# CVE-2010-1623: Denial of service in n/a

> Remote attackers can cause a denial of service via memory consumption in the APR-util library used by Apache HTTP Server.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Oct 2010
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2010-1623, DSA-2117-1, GHSA-2cc8-vf33-qm9m, RHSA-2010:0950

## What is CVE-2010-1623?

CVE-2010-1623 is a medium-severity denial of service vulnerability in Apache Http Server, published on 4 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Memory leak in the apr_brigade_split_line function in buckets/apr_brigade.c in the Apache Portable Runtime Utility library (aka APR-util) before 1.3.10, as used in the mod_reqtimeout module in the Apache HTTP Server and other software, allows remote attackers to cause a denial of service (memory consumption) via unspecified vectors related to the destruction of an APR bucket.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2010-1623?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `apr-util` | Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-devel` | Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util` | Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-devel` | Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util` | Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-devel` | Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util` | Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util-devel` | Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-22.el4_8.3 |
| `apr-util` | Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-docs` | Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-mysql` | Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util` | Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-devel` | Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-docs` | Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util-mysql` | Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_5.2 |
| `apr-util` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-ldap` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-mysql` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-odbc` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-pgsql` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-sqlite` | Red Hat:enterprise_linux:6::client | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-devel` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-ldap` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-mysql` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-odbc` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-pgsql` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |
| `apr-util-sqlite` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.3.9-3.el6_0.1 |

Products: Apache Apr-Util, Apache Http Server.

## How do I fix CVE-2010-1623?

Upgrade to a fixed version.

## Is CVE-2010-1623 being exploited?

There is no known exploitation of CVE-2010-1623 in the wild and no public exploit code.

## Other vulnerabilities in Apache Http Server

- [CVE-2009-2412](https://insights.sbomify.com/CVE-2009-2412/): Integer overflow in n/a (critical 10.0)
- [CVE-2026-32327](https://insights.sbomify.com/CVE-2026-32327/): Apache Portable Runtime Utility: apr-util XML stack recursion crash (critical 9.1)
- [CVE-2026-34191](https://insights.sbomify.com/CVE-2026-34191/): Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle (critical 9.1)
- [CVE-2025-49506](https://insights.sbomify.com/CVE-2025-49506/): Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack (high 7.5)
- [CVE-2026-34501](https://insights.sbomify.com/CVE-2026-34501/): Apache Portable Runtime Utility: Heap buffer overflow in APR redis client (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-1623 and fix it if it is affected.

What it is: CVE-2010-1623 is a medium-severity denial of service vulnerability in Apache Http Server, published on 4 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2010-1623 in the wild and no public exploit code.

Affected product: Apache Http Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2010-1623/ (Markdown: https://insights.sbomify.com/CVE-2010-1623/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-1623
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-1623
- OSV: https://osv.dev/vulnerability/CVE-2010-1623

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-1623/
Summaries are generated and may contain mistakes; the official description above is the record.