Is CVE-2021-34791 in the CISA KEV catalog?

No. CVE-2021-34791 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34791?

CVE-2021-34791 has a CVSS v3 base score of 4.7 (MEDIUM).

What is the EPSS score for CVE-2021-34791?

CVE-2021-34791 has an EPSS score of 1.10% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34791?

Upgrade adaptive security appliance to 9.8.4.40 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-34791

MEDIUM

4.7

CVSS v3

NVD

Description

Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming.

CWE-358 CWE-20Improper Input Validation

How to fix

Remediation Available

adaptive security applianceNVD

Affected:< 9.8.4.40Fixed in:9.8.4.40CVE-2021-34791derived from NVD

adaptive security appliance softwareNVD

Affected:>= 9.15.0, < 9.15.1.15Fixed in:9.15.1.15CVE-2021-34791derived from NVD

firepower threat defenseNVD

Affected:>= 6.7.0, < 6.7.0.2Fixed in:6.7.0.2CVE-2021-34791derived 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 InteractionRequired

ScopeChanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.10%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% 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.