Is CVE-2020-27720 in the CISA KEV catalog?

No. CVE-2020-27720 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27720?

CVE-2020-27720 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-27720?

CVE-2020-27720 has an EPSS score of 1.42% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27720?

Upgrade big-ip carrier-grade nat to 16.0.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27720

HIGH

7.5

CVSS v3

NVD

Description

On BIG-IP LTM/CGNAT version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5, when processing NAT66 traffic with Port Block Allocation (PBA) mode and SP-DAG enabled, and dag-ipv6-prefix-len configured with a value less than the default of 128, an undisclosed traffic pattern may cause the Traffic Management Microkernel (TMM) to restart.

How to fix

Remediation Available

big-ip carrier-grade natNVD

Affected:>= 16.0.0, < 16.0.1Fixed in:16.0.1CVE-2020-27720derived from NVD

big-ip local traffic managerNVD

Affected:>= 16.0.0, < 16.0.1Fixed in:16.0.1CVE-2020-27720derived 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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.42%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Vendor Advisory1

support.f5.com

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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 2024-11-21.