Is CVE-2020-3308 in the CISA KEV catalog?

No. CVE-2020-3308 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-3308?

CVE-2020-3308 has a CVSS v3 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2020-3308?

CVE-2020-3308 has an EPSS score of 0.60% (45th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-3308?

Upgrade firepower threat defense to 6.2.2.1 or later.

CVE & CISA-KEV Catalog

CVE-2020-3308

MEDIUM

4.9

CVSS v3

NVD

Description

A vulnerability in the Image Signature Verification feature of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.

CWE-347

How to fix

Remediation Available

firepower threat defenseNVD

Affected:< 6.2.2.1Fixed in:6.2.2.1CVE-2020-3308derived from NVD

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 ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.60%probability of exploitation in 30 days

45thpercentile

Moderate risk: more likely to be exploited than 45% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Related Vulnerabilities

Other CWE-347 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-16042	Medium	6.5	82%	-	-
CVE-2025-59718	Critical	9.8	66%	KEV	Fix
CVE-2025-25292	Critical	9.8	64%	-	Fix
CVE-2021-22160	Critical	9.8	53%	-	Fix
CVE-2013-3900	Medium	5.5	45%	KEV	-
CVE-2018-0114	High	7.5	43%	-	Fix

Embed a live status badge for CVE-2020-3308

Markdown

[![CVE-2020-3308](https://tridentstack.com/cve/badge/CVE-2020-3308.svg)](https://tridentstack.com/cve/CVE-2020-3308)

HTML

<a href="https://tridentstack.com/cve/CVE-2020-3308"><img src="https://tridentstack.com/cve/badge/CVE-2020-3308.svg" alt="CVE-2020-3308"></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.

Start free

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 2024-11-26.