CVE-2021-34791
Medium
Description
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.
SeverityMedium
CVSS4.7
Exploit probability—
Product
Cisco Adaptive Security Appliance
PublishedOct 27, 2021
First seenOct 27, 2021
Weakness typeCWE-358CWE-358
How to fix
Update
- cisco adaptive_security_appliance9.8.4.40 or later
- cisco secure_firewall_threat_defense6.4.0.12, 6.6.5, 6.7.0.2 or later
- cisco adaptive_security_appliance_software9.12.4.18, 9.14.2.15, 9.15.1.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco adaptive_security_appliance | v < 9.8.4.40 | 9.8.4.40 |
| cisco secure_firewall_threat_defense | v < 6.4.0.12, 6.5.0 ≤ v < 6.6.5, 6.7.0 ≤ v < 6.7.0.2 | 6.4.0.12, 6.6.5, 6.7.0.2 |
| cisco adaptive_security_appliance_software | 9.12.0 ≤ v < 9.12.4.18, 9.13.0 ≤ v < 9.14.2.15, 9.15.0 ≤ v < 9.15.1.15 | 9.12.4.18, 9.14.2.15, 9.15.1.15 |
| cisco asa_5512-x_firmware | 009.008, 009.015 | — |
| cisco asa_5505_firmware | 009.008, 009.015 | — |
| cisco asa_5515-x_firmware | 009.008, 009.015 | — |
| cisco asa_5525-x_firmware | 009.008, 009.015 | — |
| cisco asa_5545-x_firmware | 009.008, 009.015 | — |
| cisco asa_5555-x_firmware | 009.008, 009.015 | — |
| cisco asa_5580_firmware | 009.008, 009.015 | — |
| cisco asa_5585-x_firmware | 009.008, 009.015 | — |
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