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ExploitedIn CISA KEVFix available

CVE-2020-3433

Exploitation confirmed. First attested on 2022-10-24 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-08-17
  • Fixed in4.9.00086
  • WeaknessCWE-427

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the interprocess communication (IPC) channel of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system. The vulnerability is due to insufficient validation of resources that are loaded by the application at run time. An attacker could exploit this vulnerability by sending a crafted IPC message to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected machine with SYSTEM privileges. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system.

Timeline

dates in UTC
  1. 2020-08-1718:15CVE publishedNVD
  2. 2022-10-24Added to the CISA KEV catalogCISA KEV
  3. 2022-10-24Listed as exploited by GCVEGCVE
  4. 2022-10-24Exploitation first reportedCISA KEV
  5. 2024-11-0816:10SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Cisco anyconnect secure mobility client
BranchAffectedFixed in
4.9< 4.9.000864.9.00086

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As cisco, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Cisco AnyConnect Secure Mobility Client

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-09-30

Fix

  1. Update Cisco anyconnect secure mobility client to 4.9.00086
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-11-14

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/windows/local/anyconnect_lperank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-10-24
Patch Due Date
2022-11-14
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2020-08-17
Last Modified
2026-08-12
NVD status
Analyzed
GitHub Advisory
GHSA-v63m-wv25-vhmp

Frequently asked questions

What is CVE-2020-3433?

A vulnerability in the interprocess communication (IPC) channel of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system. The vulnerability is due to insufficient validation of resources that are loaded by the application at run time. An attacker could exploit this vulnerability by sending a crafted IPC message to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected machine with SYSTEM privileges. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system.

Is CVE-2020-3433 actively exploited?

Yes. CVE-2020-3433 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-11-14.

What is the CVSS score for CVE-2020-3433?

CVE-2020-3433 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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