Is CVE-2020-3555 in the CISA KEV catalog?

No. CVE-2020-3555 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-3555?

CVE-2020-3555 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2020-3555?

CVE-2020-3555 has an EPSS score of 1.66% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-3555?

Upgrade adaptive security appliance to 9.6.4.43 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-3555

MEDIUMEPSS 74th pctl

6.8

CVSS v3

NVD

Description

A vulnerability in the SIP inspection process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. An attacker could exploit this vulnerability by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.

CWE-404

How to fix

Remediation Available

adaptive security applianceNVD

Affected:< 9.6.4.43Fixed in:9.6.4.43CVE-2020-3555derived from NVD

adaptive security appliance softwareNVD

Affected:>= 9.14.0, < 9.14.1.19Fixed in:9.14.1.19CVE-2020-3555derived from NVD

firepower threat defenseNVD

Affected:>= 6.5.0, < 6.5.0.5Fixed in:6.5.0.5CVE-2020-3555derived 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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.66%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Vendor Advisory1

tools.cisco.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.