PT-2021-4604 · Cisco · Cisco Asa+1

Sanmith Prakash · Published 2021-10-27 · Updated 2023-08-16 · CVE-2021-34783

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software (affected versions not specified)

Description A vulnerability in the software-based SSL/TLS message handler could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This issue is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note that Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Buffer Overflow

RCE

Weakness Enumeration

CWE-119

CWE-20

Related Identifiers

BDU:2021-05287

CVE-2021-34783

Affected Products

Cisco Asa

Firepower Threat Defense

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2021-34783 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/671730 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34783 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05287 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M · Vendor Advisory
• https://t.me/cibsecurity/31319 · Telegram Post
• https://t.me/cvenotify/22517 · Telegram Post
• https://t.me/cvenotify/22519 · Telegram Post