# CVE-2011-2770: Cross-site scripting in n/a

> Remote attackers can inject arbitrary web script or HTML via error messages in the man2html CGI script, potentially compromising user sessions.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 17 Nov 2011
- **Updated:** 17 Sep 2024
- **Also known as:** DEBIAN-CVE-2011-2770, DSA-2335-1, GHSA-h3h2-vg7m-797v

## What is CVE-2011-2770?

CVE-2011-2770 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 Nov 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting (XSS) vulnerability in man2html.cgi.c in man2html 1.6, and possibly other version, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors related to error messages.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2011-2770?

It affects 1 product.


Products: Robert Luberda Man2html.

## How do I fix CVE-2011-2770?

Apply the vendor's patch.

## Is CVE-2011-2770 being exploited?

There is no known exploitation of CVE-2011-2770 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-2770 and fix it if it is affected.

What it is: CVE-2011-2770 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 Nov 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2011-2770 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-2011-2770/ (Markdown: https://insights.sbomify.com/CVE-2011-2770/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-2770
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-2770
- OSV: https://osv.dev/vulnerability/CVE-2011-2770

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From sbomify Insights: https://insights.sbomify.com/CVE-2011-2770/
Summaries are generated and may contain mistakes; the official description above is the record.