How severe is CVE-2024-20377?

CVE-2024-20377 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2024-20377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20377?

CVE-2024-20377 primarily affects Cisco Secure Firewall Management Center. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20377?

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

Does CVE-2024-20377 have an EU (EUVD) identifier?

Yes. CVE-2024-20377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18092.

When was CVE-2024-20377 published?

CVE-2024-20377 was published on 2024-10-23 and last updated on 2026-06-17.

CVE-2024-20377

CVE-2024-20377 is a medium-severity vulnerability in Cisco Secure Firewall Management Center with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18092
Weakness: CWE-79
Affected product: Cisco Secure Firewall Management Center
Published: 2024-10-23
Last modified: 2026-06-17

Description

A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to the web-based management interface not properly validating user-supplied input. An attacker could exploit this vulnerability by by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Frequently asked questions

What is CVE-2024-20377?: A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to the web-based management interface not properly validating user-supplied input. An attacker could exploit this vulnerability by by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
How severe is CVE-2024-20377?: CVE-2024-20377 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2024-20377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20377?: CVE-2024-20377 primarily affects Cisco Secure Firewall Management Center. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20377?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-20377 have an EU (EUVD) identifier?: Yes. CVE-2024-20377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18092.
When was CVE-2024-20377 published?: CVE-2024-20377 was published on 2024-10-23 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-infodisc-RL4mJFer

Affected products (39)

cpe:2.3:a:cisco:secure_firewall_management_center:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.8:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.2.8.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:7.4.1.1:*:*:*:*:*:*:*

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