A vulnerability in the H.323 application level gateway (ALG) used by the Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass the ALG. This vulnerability is due to insufficient data validation of traffic that is traversing the ALG. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device. A successful exploit could allow the attacker to bypass the ALG and open connections that should not be allowed to a remote device located behind the ALG. Note: This vulnerability has been publicly discussed as NAT Slipstreaming.
Published 2021-09-23 03:15:13
Updated 2022-10-24 20:02:35
View at NVD,   CVE.org

Products affected by CVE-2021-1616

Exploit prediction scoring system (EPSS) score for CVE-2021-1616

0.11%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 43 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1616

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.3
MEDIUM AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
NIST
4.7
MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
2.8
1.4
Cisco Systems, Inc.
4.7
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
2.8
1.4
NIST

CWE ids for CVE-2021-1616

  • The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
    Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2021-1616

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