# CVE-2007-4771: Memory corruption in n/a

> Heap-based buffer overflow in ICU library allows attackers to cause denial of service or potentially execute code via crafted regular expressions.

- **Severity:** Critical 9.3 (`AV:N/AC:M/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Jan 2008
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-4771, GHSA-78gp-g683-v26p

## What is CVE-2007-4771?

CVE-2007-4771 is a critical memory corruption vulnerability in n/a, published on 28 Jan 2008. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Heap-based buffer overflow in the doInterval function in regexcmp.cpp in libicu in International Components for Unicode (ICU) 3.8.1 and earlier allows context-dependent attackers to cause a denial of service (memory consumption) and possibly have unspecified other impact via a regular expression that writes a large amount of data to the backtracking stack.  NOTE: some of these details are obtained from third party information.

Weakness: CWE-399

## Which versions are affected by CVE-2007-4771?

It affects 1 product.


Products: Icu-Project International Components for Unicode.

## How do I fix CVE-2007-4771?

Upgrade to a fixed version.

## Is CVE-2007-4771 being exploited?

There is no known exploitation of CVE-2007-4771 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-18928](https://insights.sbomify.com/CVE-2018-18928/): Integer overflow in n/a (critical 9.8)
- [CVE-2017-17484](https://insights.sbomify.com/CVE-2017-17484/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-14952](https://insights.sbomify.com/CVE-2017-14952/): Use after free in n/a (critical 9.8)
- [CVE-2014-9911](https://insights.sbomify.com/CVE-2014-9911/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-7415](https://insights.sbomify.com/CVE-2016-7415/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4771 and fix it if it is affected.

What it is: CVE-2007-4771 is a critical memory corruption vulnerability in n/a, published on 28 Jan 2008. 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-2007-4771 in the wild and no public exploit code.

Affected product: n/a. 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-2007-4771/ (Markdown: https://insights.sbomify.com/CVE-2007-4771/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4771
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4771
- OSV: https://osv.dev/vulnerability/CVE-2007-4771

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4771/
Summaries are generated and may contain mistakes; the official description above is the record.