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4.7mediumMedium

CVE-2021-34790

Cisco Adaptive Security Appliance

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.

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is reachable over a network, without needing local access.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, no account is needed.
  • Beyond that, someone has to be persuaded to take an action first.

Scoring

CVSS
4.7 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Weakness
CWE-358
Assigned by
psirt@cisco.com

Dates

Published
2021-10-27
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Adaptive Security Appliance- 9.8.4.40
  • Cisco Secure Firewall Threat Defense- 6.4.0.12, 6.5.0 - 6.6.5, 6.7.0 - 6.7.0.2
  • Cisco Adaptive Security Appliance Software9.12.0 - 9.12.4.29, 9.13.0 - 9.14.2.15, 9.15.0 - 9.15.1.15
  • Cisco Asa 5512-X Firmware009.008, 009.015
  • Cisco Asa 5512-Xall versions
  • Cisco Asa 5505 Firmware009.008, 009.015
  • Cisco Asa 5505all versions
  • Cisco Asa 5515-X Firmware009.008, 009.015
  • Cisco Asa 5515-Xall versions
  • Cisco Asa 5525-X Firmware009.008, 009.015
  • Cisco Asa 5525-Xall versions
  • Cisco Asa 5545-X Firmware009.008, 009.015

As listed in the NVD configuration data. Not a statement about your estate.

References