CVE-2020-25853

CVSS V2 Medium 5 CVSS V3 High 7.5
Description
The function CheckMic() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an internal function, _rt_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK.
Overview
  • CVE ID
  • CVE-2020-25853
  • Assigner
  • vuln@vdoo.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-02-03T17:15:14
  • Last Modified Date
  • 2021-02-08T18:23:25
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:realtek:rtl8195a_firmware:*:*:*:*:*:*:*:* 1 OR 2.08
cpe:2.3:h:realtek:rtl8195a:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ Exploit Third Party Advisory
History
Created Old Value New Value Data Type Notes
2022-05-10 07:24:02 Added to TrackCVE
2022-12-05 21:18:24 2021-02-03T17:15Z 2021-02-03T17:15:14 CVE Published Date updated
2022-12-05 21:18:24 2021-02-08T18:23:25 CVE Modified Date updated
2022-12-05 21:18:24 Analyzed Vulnerability Status updated