Is CVE-2013-2566 in the CISA KEV catalog?

No. CVE-2013-2566 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-2566?

CVE-2013-2566 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2013-2566?

CVE-2013-2566 has an EPSS score of 84.42% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-2566?

Upgrade DeveloperEdition to 17.0.11 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2013-2566

MEDIUMEPSS 100th pctl

5.9

CVSS v3

NVD

Description

The RC4 algorithm, as used in the TLS protocol and SSL protocol, has many single-byte biases, which makes it easier for remote attackers to conduct plaintext-recovery attacks via statistical analysis of ciphertext in a large number of sessions that use the same plaintext.

CWE-326

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:17.0.11Fixed in:17.0.11Mozilla

Affected:25.0.1Fixed in:25.0.1Mozilla

Affected:24.1.0 24.1.1Fixed in:24.1.1Mozilla

Mozilla Firefox (en-US)Windows application

Affected:17.0.11Fixed in:17.0.11Mozilla

Affected:24.1.0 24.1.1Fixed in:24.1.1Mozilla

Affected:25.0.1Fixed in:25.0.1Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:24.1.1Fixed in:24.1.1Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

84.42%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

Related Vulnerabilities

Other CWE-326 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0224	High	7.4	95%	-	Fix
CVE-2017-1000486	Critical	9.8	94%	KEV	Fix
CVE-2017-11317	Critical	9.8	83%	KEV	-
CVE-2018-18325	High	7.5	74%	KEV	-
CVE-2018-15811	High	7.5	74%	KEV	-
CVE-2011-3389	Medium	4.3	73%	-	Fix

Embed a live status badge for CVE-2013-2566

Markdown

[![CVE-2013-2566](https://tridentstack.com/cve/badge/CVE-2013-2566.svg)](https://tridentstack.com/cve/CVE-2013-2566)

HTML

<a href="https://tridentstack.com/cve/CVE-2013-2566"><img src="https://tridentstack.com/cve/badge/CVE-2013-2566.svg" alt="CVE-2013-2566"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.