CVE-2012-4507: The strchr function in procmime.c in Claws Mail (aka claws-mail) 3.8.1 allows remote attackers to cause a deni

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MEDIUM 5.0WATCHLISTDOWNGRADE

CVE-2012-4507 is a medium-severity flaw (CVSS 5.0) affecting claws-mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The strchr function in procmime.c in Claws Mail (aka claws-mail) 3.8.1 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted email.

Why this priority

On your watchlist

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Published	2012-10-22
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: claws-mail

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

Am I affected?

Timeline

2012-10-22 23:55 UTCPublished CVE record published
2026-06-16 23:45 UTCUpdated Record last modified

claws-mail claws-mail DOWNGRADE

Affected: 3.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.8.1

1. Check installed version

apt-cache policy claws-mail || rpm -q claws-mail || claws-mail --version

2. No fixed release: DOWNGRADE to a release before 3.8.1 (Debian / Ubuntu)

apt-cache madison claws-mail sudo apt install claws-mail=<VERSION_BEFORE_3.8.1> sudo apt-mark hold claws-mail

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

dnf --showduplicates list claws-mail sudo dnf downgrade claws-mail-<VERSION_BEFORE_3.8.1> sudo dnf versionlock add claws-mail

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-2012-4507?

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

Is CVE-2012-4507 being exploited?

CVE-2012-4507 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-2012-4507 affect?

CVE-2012-4507 affects claws-mail. Severity is medium (CVSS 5.0). The strchr function in procmime.c in Claws Mail (aka claws-mail) 3.8.1 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted email.

How urgent is CVE-2012-4507?

Priority 44/100. On your watchlist

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References

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