Medium severity · published Oct 27, 2021
CVE-2021-34790
Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower…
5.3
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Adaptive Security Appliance · Cisco
before 9.8.4.40 · source: NVD
AS
Adaptive Security Appliance Software · Cisco
9.12.0 before 9.12.4.29; 9.13.0 before 9.14.2.15; 9.15.0 before 9.15.1.15 · source: NVD
A5
Asa 5505 Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5512-x Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5515-x Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5525-x Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5545-x Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5555-x Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5580 Firmware · Cisco
009.008; 009.015 · source: NVD
A5
Asa 5585-x Firmware · Cisco
009.008; 009.015 · source: NVD
SF
Secure Firewall Threat Defense · Cisco
before 6.4.0.12; 6.5.0 before 6.6.5; 6.7.0 before 6.7.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34790
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34790
Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng
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