How severe is CVE-2013-5593?

CVE-2013-5593 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-5593 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-5593?

CVE-2013-5593 primarily affects Mozilla Firefox. In total, 129 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-5593?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-5593 published?

CVE-2013-5593 was published on 2013-10-30 and last updated on 2026-06-16.

CVE-2013-5593

CVE-2013-5593 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Mozilla Firefox
Published: 2013-10-30
Last modified: 2026-06-16

Description

The SELECT element implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 does not properly restrict the nature or placement of HTML within a dropdown menu, which allows remote attackers to spoof the address bar or conduct clickjacking attacks via vectors that trigger navigation off of a page containing this element.

Frequently asked questions

What is CVE-2013-5593?: The SELECT element implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 does not properly restrict the nature or placement of HTML within a dropdown menu, which allows remote attackers to spoof the address bar or conduct clickjacking attacks via vectors that trigger navigation off of a page containing this element.
How severe is CVE-2013-5593?: CVE-2013-5593 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-5593 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5593?: CVE-2013-5593 primarily affects Mozilla Firefox. In total, 129 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5593?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-5593 published?: CVE-2013-5593 was published on 2013-10-30 and last updated on 2026-06-16.

References

Affected products (129)

cpe:2.3:a:mozilla:firefox:24.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:24.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:24.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:24.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.9:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:19.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:19.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:19.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:20.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:20.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:21.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:22.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:23.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:23.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:beta2:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:alpha_1:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:alpha_2:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:alpha_3:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:beta_1:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:beta_2:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.0.6:*:*:*:*:*:*:*

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