A vulnerability in the DLL loading mechanism of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected device if the VPN Posture (HostScan) Module is installed on the AnyConnect client. This vulnerability is due to a race condition in the signature verification process for DLL files that are loaded on an affected device. An attacker could exploit this vulnerability by sending a series of crafted interprocess communication (IPC) messages to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected device with SYSTEM privileges. To exploit this vulnerability, the attacker must have valid credentials on the Windows system.
Published 2021-06-16 18:15:09
Updated 2022-08-05 15:17:41
View at NVD,   CVE.org
Vulnerability category: Execute code

Exploit prediction scoring system (EPSS) score for CVE-2021-1567

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1567

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.2
MEDIUM AV:L/AC:H/Au:N/C:C/I:C/A:C
1.9
10.0
NIST
7.0
HIGH CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.0
5.9
Cisco Systems, Inc.
6.7
MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
0.8
5.9
NIST

CWE ids for CVE-2021-1567

  • The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
    Assigned by: ykramarz@cisco.com (Secondary)
  • The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-1567

Products affected by CVE-2021-1567

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