CVE-2021-34791

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.14% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 66.2% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-08-11.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-27 18:56Z5 YR AGO

Last updated

2024-11-07 21:43Z1 YR AGO

Reserved

2021-06-15

Assigning CNA

cisco

Record state

PUBLISHED

Severity

Medium (CVSS 4.7)

CNA CVSS vector

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

Weaknesses

• CWE-358Improperly Implemented Security Check for StandardBase
• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

ceb1507b5eea377052ab09a167641026edd4debdbf358a0dbc7afe000a9979fa

• tools.cisco.com20211027 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilitieshttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkngvendor-advisoryx_refsource_CISCO