Is CVE-2021-1501 in the CISA KEV catalog?

No. CVE-2021-1501 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1501?

CVE-2021-1501 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2021-1501?

CVE-2021-1501 has an EPSS score of 1.34% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1501?

Upgrade adaptive security appliance software to 9.15.1.15 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1501

HIGH

8.6

CVSS v3

NVD

Description

A vulnerability in the SIP inspection engine 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 crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a crash and reload of the affected device.

CWE-613

How to fix

Remediation Available

adaptive security appliance softwareNVD

Affected:>= 9.15, < 9.15.1.15Fixed in:9.15.1.15CVE-2021-1501derived from NVD

firepower threat defenseNVD

Affected:>= 6.7.0, < 6.7.0.2Fixed in:6.7.0.2CVE-2021-1501derived 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

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.34%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% 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.