CVE-2012-0962: Aptdaemon 0.43 in Ubuntu 11.10 and 12.04 LTS uses short IDs when importing PPA GPG keys from a keyserver, whic

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MEDIUM 4.3WATCHLISTDOWNGRADEMITIGATE

CVE-2012-0962 is a medium-severity flaw (CVSS 4.3) affecting aptdaemon, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Aptdaemon 0.43 in Ubuntu 11.10 and 12.04 LTS uses short IDs when importing PPA GPG keys from a keyserver, which allows remote attackers to install arbitrary package repository GPG keys via a man-in-the-middle (MITM) attack.

Why this priority

On your watchlist

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Published	2012-12-26
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2012-12-26 22:55 UTCPublished CVE record published
2026-06-16 23:38 UTCUpdated Record last modified

sebastian heinlein aptdaemon DOWNGRADE

Affected: 0.43

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.43

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.43 (Debian / Ubuntu)

apt-cache madison aptdaemon sudo apt install aptdaemon=<VERSION_BEFORE_0.43> sudo apt-mark hold aptdaemon

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

dnf --showduplicates list aptdaemon sudo dnf downgrade aptdaemon-<VERSION_BEFORE_0.43> sudo dnf versionlock add aptdaemon

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.

canonical ubuntu linux MITIGATE

Affected: 11.10 · 12.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.10

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-2012-0962?

aptdaemon: downgrade or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-0962 being exploited?

CVE-2012-0962 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-2012-0962 affect?

CVE-2012-0962 affects aptdaemon, ubuntu linux. Severity is medium (CVSS 4.3). Aptdaemon 0.43 in Ubuntu 11.10 and 12.04 LTS uses short IDs when importing PPA GPG keys from a keyserver, which allows remote attackers to install arbitrary package repository GPG keys via a man-in-the-middle (MITM) attack.

How urgent is CVE-2012-0962?

Priority 40/100. On your watchlist

Software pages

Ubuntu vulnerabilities

Related CVEs

CVE-2020-15703 MEDIUM 4.0 DOWNGRADE There is no input validation on the Locale property in an apt transaction

References

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