CVE-2010-4339: Cross-site scripting (XSS) vulnerability in Hypermail 2.2.0 allows remote attackers to inject arbitrary web sc

Routine

MEDIUM 4.3DOWNGRADE

CVE-2010-4339 is a medium-severity flaw (CVSS 4.3) affecting hypermail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Hypermail 2.2.0 allows remote attackers to inject arbitrary web script or HTML via a crafted From address, which is not properly handled when indexing 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	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-79
Published	2011-01-14
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: hypermail-project

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

Am I affected?

Timeline

2011-01-14 23:00 UTCPublished CVE record published
2026-06-16 23:24 UTCUpdated Record last modified

hypermail-project hypermail DOWNGRADE

Affected: 2.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison hypermail sudo apt install hypermail=<VERSION_BEFORE_2.2.0> sudo apt-mark hold hypermail

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

dnf --showduplicates list hypermail sudo dnf downgrade hypermail-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add hypermail

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-2010-4339?

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

Is CVE-2010-4339 being exploited?

CVE-2010-4339 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-2010-4339 affect?

CVE-2010-4339 affects hypermail. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in Hypermail 2.2.0 allows remote attackers to inject arbitrary web script or HTML via a crafted From address, which is not properly handled when indexing messages.

How urgent is CVE-2010-4339?

Priority 30/100. No elevated risk signals yet.

Related CVEs

CVE-2003-0057 HIGH 7.5 DOWNGRADE Multiple buffer overflows in Hypermail 2 before 2.1.6 allows remote attackers to cause a denial of service and
CVE-2001-0901 HIGH 7.5 MITIGATE Hypermail allows remote attackers to execute arbitrary commands on a server supporting SSI via an attachment w

References

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