Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a flaw in the detection algorithm. An attacker could exploit this vulnerability by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.
Published 2021-01-13 22:15:21
Updated 2023-05-22 18:57:25
View at NVD,   CVE.org

Products affected by CVE-2021-1236

Exploit prediction scoring system (EPSS) score for CVE-2021-1236

0.23%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1236

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
NIST
4.0
MEDIUM CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
2.2
1.4
Cisco Systems, Inc.
5.3
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.9
1.4
NIST

CWE ids for CVE-2021-1236

  • The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
    Assigned by:
    • nvd@nist.gov (Primary)
    • ykramarz@cisco.com (Secondary)

References for CVE-2021-1236

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