PT-2022-5528 · Cisco · Cisco Email Security Appliance+1

Published 2022-11-02 · Updated 2024-01-25 · CVE-2022-20960

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Cisco Email Security Appliance (ESA) (affected versions not specified)

Description A vulnerability in Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain TLS connections that are processed by an affected device. An attacker could exploit this vulnerability by establishing a large number of concurrent TLS connections to an affected device. A successful exploit could allow the attacker to cause the device to drop new TLS email messages that come from the associated email servers. Exploitation of this vulnerability does not cause the affected device to unexpectedly reload. The device will recover autonomously within a few hours of when the attack is halted or mitigated.

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

Resource Exhaustion

Improper Certificate Validation

Weakness Enumeration

CWE-400

CWE-295

Related Identifiers

BDU:2022-06857

CVE-2022-20960

Affected Products

Cisco Asyncos

Cisco Email Security Appliance

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2022-20960 · Security Note
• https://osv.dev/vulnerability/CVE-2022-20960 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-06857 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-dos-gdghHmbV · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-dos-gdghHmbV · Note
• https://t.me/cvenotify/37279 · Telegram Post