How severe is CVE-2020-27713?

CVE-2020-27713 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-27713 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27713?

CVE-2020-27713 affects F5 Big-ip Advanced Firewall Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27713?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-27713 published?

CVE-2020-27713 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-27713

CVE-2020-27713 is a high-severity vulnerability in F5 Big-ip Advanced Firewall Manager with a CVSS 3.x base score of 7.5. 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-401.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-401
Affected product: F5 Big-ip Advanced Firewall Manager
Published: 2020-12-11
Last modified: 2026-06-17

Description

In certain configurations on version 13.1.3.4, when a BIG-IP AFM HTTP security profile is applied to a virtual server and the BIG-IP system receives a request with specific characteristics, the connection is reset and the Traffic Management Microkernel (TMM) leaks memory.

Frequently asked questions

What is CVE-2020-27713?: In certain configurations on version 13.1.3.4, when a BIG-IP AFM HTTP security profile is applied to a virtual server and the BIG-IP system receives a request with specific characteristics, the connection is reset and the Traffic Management Microkernel (TMM) leaks memory.
How severe is CVE-2020-27713?: CVE-2020-27713 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-27713 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27713?: CVE-2020-27713 affects F5 Big-ip Advanced Firewall Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27713?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-27713 published?: CVE-2020-27713 was published on 2020-12-11 and last updated on 2026-06-17.

References

https://support.f5.com/csp/article/K37960100

Affected products (1)

cpe:2.3:a:f5:big-ip_advanced_firewall_manager:13.1.3.4:*:*:*:*:*:*:*

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