CVE-2011-2770: Cross-site scripting (XSS) vulnerability in man2html.cgi.c in man2html 1.6, and possibly other version, allows

Routine

MEDIUM 4.3DOWNGRADE

CVE-2011-2770 is a medium-severity flaw (CVSS 4.3) affecting man2html. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-79
Published	2011-11-17
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: robert luberda

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-11-17 19:55 UTCPublished CVE record published
2026-06-16 23:31 UTCUpdated Record last modified

robert luberda man2html DOWNGRADE

Affected: 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6

1. Check installed version

apt-cache policy man2html || rpm -q man2html || man2html --version

2. No fixed release: DOWNGRADE to a release before 1.6 (Debian / Ubuntu)

apt-cache madison man2html sudo apt install man2html=<VERSION_BEFORE_1.6> sudo apt-mark hold man2html

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list man2html sudo dnf downgrade man2html-<VERSION_BEFORE_1.6> sudo dnf versionlock add man2html

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-2770?

man2html: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-2770 being exploited?

CVE-2011-2770 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-2770 affect?

CVE-2011-2770 affects man2html. Severity is medium (CVSS 4.3). 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.

How urgent is CVE-2011-2770?

Priority 31/100. No elevated risk signals yet.

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References

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