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Cisco Patches Excessive-Severity Vulnerability Affecting ASA and Firepower Options


Sep 2, 2022

Cisco on Wednesday launched patches to include a number of flaws in its software program that may very well be abused to leak delicate data on vulnerable home equipment.

The problem, assigned the identifier CVE-2022-20866 (CVSS rating: 7.4), has been described as a “logic error” when dealing with RSA keys on units operating Cisco Adaptive Safety Equipment (ASA) Software program and Cisco Firepower Risk Protection (FTD) Software program.

Profitable exploitation of the flaw may enable an attacker to retrieve the RSA personal key by the use of a Lenstra side-channel assault towards the focused system.

“If an attacker obtains the RSA personal key, they may use the important thing to impersonate a tool that’s operating Cisco ASA Software program or Cisco FTD Software program or to decrypt the system site visitors,” Cisco warned in an advisory issued on August 10.


Cisco famous that the flaw impacts solely Cisco ASA Software program releases 9.16.1 and later and Cisco FTD Software program releases 7.0.0 and later. Affected merchandise are listed beneath –

  • ASA 5506-X with FirePOWER Providers
  • ASA 5506H-X with FirePOWER Providers
  • ASA 5506W-X with FirePOWER Providers
  • ASA 5508-X with FirePOWER Providers
  • ASA 5516-X with FirePOWER Providers
  • Firepower 1000 Collection Subsequent-Era Firewall
  • Firepower 2100 Collection Safety Home equipment
  • Firepower 4100 Collection Safety Home equipment
  • Firepower 9300 Collection Safety Home equipment, and
  • Safe Firewall 3100

ASA software program variations,, and 9.18.2, and FTD software program releases 7.0.4,, and seven.2.0.1 have been launched to handle the safety vulnerability.

Cisco credited Nadia Heninger and George Sullivan of the College of California San Diego and Jackson Sippe and Eric Wustrow of the College of Colorado Boulder for reporting the bug.

Additionally patched by Cisco is a client-side request smuggling flaw within the Clientless SSL VPN (WebVPN) element of Cisco Adaptive Safety Equipment (ASA) Software program that would allow an unauthenticated, distant attacker to conduct browser-based assaults, equivalent to cross-site scripting, towards the sufferer.


The corporate stated the weak spot, CVE-2022-20713 (CVSS rating: 4.3), affect Cisco units operating a launch of Cisco ASA Software program sooner than launch 9.17(1) and have the Clientless SSL VPN function turned on.

Whereas there are not any workarounds to remediate the flaw, affected customers can disable the Clientless SSL VPN function, though Cisco warns doing so “might negatively affect the performance or efficiency” of the community.

The event comes as cybersecurity agency Rapid7 disclosed particulars of 10 bugs present in ASA, Adaptive Safety System Supervisor (ASDM), and FirePOWER Providers Software program for ASA, seven of which have since been addressed by Cisco.

These embody CVE-2022-20829 (CVSS rating: 9.1), CVE-2022-20651 (CVSS rating: 5.5), CVE-2021-1585 (CVSS rating: 7.5), CVE-2022-20828 (CVSS rating: 6.5), and three different flaws that haven’t been assigned a CVE identifier.

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