What’s Vulnerable › Vulnerabilities

CVE-2020-26146

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-20

Description

An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WPA, WPA2, and WPA3 implementations reassemble fragments with non-consecutive packet numbers. An adversary can abuse this to exfiltrate selected fragments. This vulnerability is exploitable when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used. Note that WEP is vulnerable to this attack by design.

Affected products

• Arista C-100 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista C-110 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista C-120 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista C-130 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista C-200 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista C-230 Firmware: before 10.0.1-31 — fixed in 10.0.1-31
• Arista C-235 Firmware: before 10.0.1-31 — fixed in 10.0.1-31
• Arista C-250 Firmware: before 10.0.1-31 — fixed in 10.0.1-31
• Arista C-260 Firmware: before 10.0.1-31 — fixed in 10.0.1-31
• Arista C-65 Firmware: all versions
• Arista C-75 Firmware: all versions
• Arista O-105 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista O-90 Firmware: all versions
• Arista W-118 Firmware: before 11.0.0-36 — fixed in 11.0.0-36
• Arista W-68 Firmware: all versions
• Samsung Galaxy I9305 Firmware: 4.4.4
• Siemens Scalance W1700 Ieee 802.11Ac Firmware: all versions
• Siemens Scalance W1750D Firmware: before 8.7.1.3 — fixed in 8.7.1.3
• Siemens Scalance W700 Ieee 802.11N Firmware: all versions

How to fix

Upgrade to a fixed version: Arista C-100 Firmware 11.0.0-36; Arista C-110 Firmware 11.0.0-36; Arista C-120 Firmware 11.0.0-36; Arista C-130 Firmware 11.0.0-36; Arista C-200 Firmware 11.0.0-36; Arista C-230 Firmware 10.0.1-31; Arista C-235 Firmware 10.0.1-31; Arista C-250 Firmware 10.0.1-31; Arista C-260 Firmware 10.0.1-31; Arista O-105 Firmware 11.0.0-36; Arista W-118 Firmware 11.0.0-36; Siemens Scalance W1750D Firmware 8.7.1.3. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/05/11/12
• https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf
• https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu
• https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63
• https://www.fragattacks.com
• http://www.openwall.com/lists/oss-security/2021/05/11/12
• https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf
• https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu
• https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63
• https://www.fragattacks.com

Get alerted when CVE-2020-26146 or the next vulnerability affects your stack