CVE-2011-4407: ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA G

Q: How do I fix CVE-2011-4407?

software-properties: upgrade to newer than 0.81.13.1; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2011-4407 being exploited?

CVE-2011-4407 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-4407 affect?

CVE-2011-4407 affects software-properties, ubuntu linux. Severity is medium (CVSS 4.3). ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA GPG key fingerprints, which allows man-in-the-middle (MITM) attackers to spoof GPG keys for a package repository.

Q: How urgent is CVE-2011-4407?

Priority 33/100. On your watchlist

Routine

MEDIUM 4.3WATCHLISTUPGRADEMITIGATE

CVE-2011-4407 is a medium-severity flaw (CVSS 4.3) affecting software-properties, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA GPG key fingerprints, which allows man-in-the-middle (MITM) attackers to spoof GPG keys for a package repository.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-20
Published	2014-05-14
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: canonical

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

Am I affected?

Timeline

2014-05-14 00:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

canonical software-properties UPGRADE

Affected: <= 0.81.13.1

Fixed in: newer than 0.81.13.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy software-properties || rpm -q software-properties || software-properties --version

2. UPGRADE to newer than 0.81.13.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade software-properties

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade software-properties

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

canonical ubuntu linux MITIGATE

Affected: 10.04 · 10.10 · 11.04 · 11.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2011-4407?

software-properties: upgrade to newer than 0.81.13.1; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-4407 being exploited?

CVE-2011-4407 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-2011-4407 affect?

CVE-2011-4407 affects software-properties, ubuntu linux. Severity is medium (CVSS 4.3). ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA GPG key fingerprints, which allows man-in-the-middle (MITM) attackers to spoof GPG keys for a package repository.

How urgent is CVE-2011-4407?

Priority 33/100. On your watchlist

Software pages

Ubuntu vulnerabilities

Related CVEs

CVE-2013-1061 MEDIUM 4.6 DOWNGRADE MITIGATE dbus/SoftwarePropertiesDBus.py in Software Properties 0.92.17 before 0.92.17.3, 0.92.9 before 0.92.9.3, and 0.
CVE-2012-0955 MEDIUM 6.8 UPGRADE software-properties was vulnerable to a person-in-the-middle attack due to incorrect TLS certificate validatio

References

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