# CVE-2007-4991: Information disclosure in n/a

> Remote attackers can obtain sensitive destination IP addresses from other user sessions via an empty packet in the SOCKS4 Proxy.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:P/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Sep 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-x2hg-rgmp-3453

## What is CVE-2007-4991?

CVE-2007-4991 is a medium-severity vulnerability in n/a, published on 21 Sep 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The SOCKS4 Proxy in Microsoft Internet Security and Acceleration (ISA) Server 2004 SP1 and SP2 allows remote attackers to obtain potentially sensitive information (the destination IP address of another user's session) via an empty packet.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2007-4991?

It affects 1 product.


Products: Microsoft Isa Server.

## How do I fix CVE-2007-4991?

No fix has been published for CVE-2007-4991 yet. Limit exposure of the affected software until one is available.

## Is CVE-2007-4991 being exploited?

There is no known exploitation of CVE-2007-4991 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2006-7027](https://insights.sbomify.com/CVE-2006-7027/): Microsoft Internet Security and Acceleration (ISA) Server 2004 logs unusual ASCII characters in the Host header, including the tab, which al (critical 10.0)
- [CVE-2009-0562](https://insights.sbomify.com/CVE-2009-0562/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-1534](https://insights.sbomify.com/CVE-2009-1534/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-1136](https://insights.sbomify.com/CVE-2009-1136/): Code injection in n/a (critical 9.3)
- [CVE-2009-1135](https://insights.sbomify.com/CVE-2009-1135/): Auth bypass in n/a (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4991 and fix it if it is affected.

What it is: CVE-2007-4991 is a medium-severity vulnerability in n/a, published on 21 Sep 2007. 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-2007-4991 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-2007-4991/ (Markdown: https://insights.sbomify.com/CVE-2007-4991/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4991
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4991
- OSV: https://osv.dev/vulnerability/CVE-2007-4991

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4991/
Summaries are generated and may contain mistakes; the official description above is the record.