How severe is CVE-2020-3307?

CVE-2020-3307 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-3307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-3307?

CVE-2020-3307 primarily affects Cisco Secure Firewall Management Center. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-3307?

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

When was CVE-2020-3307 published?

CVE-2020-3307 was published on 2020-05-06 and last updated on 2026-06-17.

CVE-2020-3307

CVE-2020-3307 is a medium-severity vulnerability in Cisco Secure Firewall Management Center with a CVSS 3.x base score of 5.3. 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 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Secure Firewall Management Center
Published: 2020-05-06
Last modified: 2026-06-17

Description

A vulnerability in the web UI of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to write arbitrary entries to the log file on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to send incorrect information to the system log on the affected system.

Frequently asked questions

What is CVE-2020-3307?: A vulnerability in the web UI of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to write arbitrary entries to the log file on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to send incorrect information to the system log on the affected system.
How severe is CVE-2020-3307?: CVE-2020-3307 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-3307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3307?: CVE-2020-3307 primarily affects Cisco Secure Firewall Management Center. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-3307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-3307 published?: CVE-2020-3307 was published on 2020-05-06 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alfo-tHwFDmTE

Affected products (5)

cpe:2.3:a:cisco:secure_firewall_management_center:6.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:6.2.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:6.3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_management_center:6.5.0:*:*:*:*:*:*:*

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