The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn’t require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24587
Reference (s):
- CISCO:20210511 Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification Affecting Cisco Products: May 2021
- URL: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00473.html
- https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md
- https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63