CVE-2021-1236

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

2.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 80.5% 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

2021-01-13 21:17Z5 YR AGO

Last updated

2024-11-12 20:48Z1 YR AGO

Reserved

2020-11-13

Assigning CNA

cisco

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Weaknesses

• CWE-670Always-Incorrect Control Flow ImplementationClass

Data version

5.1

Document digest

918485c9423f4025c01ee6fbbbddd210c37e53fd41531331be51895b6eab0cbc

• tools.cisco.com20210113 Multiple Cisco Products Snort Application Detection Engine Policy Bypass Vulnerabilityhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-app-bypass-cSBYCATqvendor-advisory
• lists.debian.org[debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security updatehttps://lists.debian.org/debian-lts-announce/2023/02/msg00011.htmlmailing-list
• www.debian.orgDSA-5354https://www.debian.org/security/2023/dsa-5354vendor-advisory