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AUSCERT External Security Bulletin Redistribution
Multiple Products - Multiple Vulnerabilities in Frame Aggregation and
Fragmentation Implementations of 802.11 Specification (FragAttacks)
2 June 2021
AusCERT Security Bulletin Summary
Publisher: FortiGuard Labs
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2020-26139
Comment: The fixes will be introduced in the upcoming versions.
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Multiple Products - Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification (FragAttacks)
IR Number : FG-IR-21-071
Date : Jun 01, 2021
Risk : 2/5
CVSSv3 Score : 0
Impact : Information Disclosure or Exposure of Internal Resources
CVE ID : CVE-2020-26139
On May 11th, 2021, Mathy Vanhoef (New York University Abu Dhabi) published a
new paper, Fragment and Forge: Breaking Wi-Fi Through Frame Aggregation and
Fragmentation , on a number of vulnerabilities in the base 802.11 protocol
(802.11 is the standard that Wi-Fi is built on). The paper discloses three
design flaws in the 802.11 standard and nine common implementation flaws
related to aggregation and fragmentation functionality.
These vulnerabilities could allow an attacker to forge encrypted frames, which
could in turn enable the exfiltration of sensitive data from a targeted device.
Information Disclosure or Exposure of Internal Resources
FortiAP versions 4.x, 5.x, 6.x and 7.0.0 FortiAP-C versions 5.4.0 through 5.4.2
FortiAP-S versions 5.x and 6.x before 6.4.5 FortiAP-U versions 5.x and 6.x
before 6.2.1 FortiAP-W2 versions 5.x, 6.x and 7.0.0 Meru AP versions 6.x, 7.x
and 8.x before 8.6.1
FortiAP: Fix in upcoming version 7.0.1
FortiAP-S: Fix in upcoming version 7.0.1
FortiAP-W2: Fix in upcoming version 7.0.1
FortiAP-U: Fix in upcoming version 6.2.2
Meru AP: Fix in upcoming version 8.6.2
This section will be updated as additional information becomes available.
o The FragAttacks paper can be accessed via the following link:
o For more information about the vulnerabilities:
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