CVE-2009-3010: Mozilla Firefox 3.0.13 and earlier, 3.5, 3.6 a1 pre, and 3.7 a1 pre; SeaMonkey 1.1.17; and Mozilla 1.7.x and e

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MEDIUM 4.3UPGRADEUPGRADEDOWNGRADE

CVE-2009-3010 is a medium-severity flaw (CVSS 4.3) affecting firefox, mozilla, seamonkey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mozilla Firefox 3.0.13 and earlier, 3.5, 3.6 a1 pre, and 3.7 a1 pre; SeaMonkey 1.1.17; and Mozilla 1.7.x and earlier do not properly block data: URIs in Refresh headers in HTTP responses, which allows remote attackers to conduct cross-site scripting (XSS) attacks via vectors related to (1) injecting a Refresh header that contains JavaScript sequences in a data:text/html URI or (2) entering a data:text/html URI with JavaScript sequences when speci

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-08-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mozilla

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

Am I affected?

Timeline

2009-08-31 16:30 UTCPublished CVE record published
2026-06-16 23:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: <= 3.0.13 · 3.5 · 3.6 a1_prerelease · 3.7 a1_prerelease

Fixed in: newer than 3.0.13

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.0.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

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

mozilla mozilla UPGRADE

Affected: <= 1.7.12

Fixed in: newer than 1.7.12

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.7.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mozilla

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mozilla

Note

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

mozilla seamonkey DOWNGRADE

Affected: 1.1.17

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.17

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1.17 (Debian / Ubuntu)

apt-cache madison seamonkey sudo apt install seamonkey=<VERSION_BEFORE_1.1.17> sudo apt-mark hold seamonkey

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

dnf --showduplicates list seamonkey sudo dnf downgrade seamonkey-<VERSION_BEFORE_1.1.17> sudo dnf versionlock add seamonkey

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-2009-3010?

firefox: upgrade to newer than 3.0.13; mozilla: upgrade to newer than 1.7.12; seamonkey: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-3010 being exploited?

CVE-2009-3010 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-2009-3010 affect?

CVE-2009-3010 affects firefox, mozilla, seamonkey. Severity is medium (CVSS 4.3). Mozilla Firefox 3.0.13 and earlier, 3.5, 3.6 a1 pre, and 3.7 a1 pre; SeaMonkey 1.1.17; and Mozilla 1.7.x and earlier do not properly block data: URIs in Refresh headers in HTTP responses, which allows remote attackers to conduct cross-site

How urgent is CVE-2009-3010?

Priority 40/100. Public exploit reference

Software pages

Mozilla Firefox vulnerabilities

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References

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