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CVE-2020-26139

22
FAUCET Score

CVE-2020-26139 is a medium-severity vulnerability affecting the NetBSD 7.1 kernel and other products like Arista, Cisco, Debian, and Intel. It allows an attacker on the same network to cause a denial-of-service by exploiting an AP's improper forwarding of unauthenticated EAPOL frames. While the attack complexity is high, it can facilitate further client-side exploits. There is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, though it has received some community discussion and media coverage as part of the broader FragAttacks vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
7.1CPE matchmatch criteria
cpe:2.3:o:netbsd:netbsd:7.1:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arista:c-100_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arista:c-110_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arista:c-120_firmware:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.49%
Probability of exploitation in next 30 days
EPSS Percentile
93.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0649 is in the 100th percentile among its peer group of 1,749 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-348.rt7.130.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-348.el8
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt

Vendor Advisories (1)

redhatCVE-2020-26139Moderate

kernel: Forwarding EAPOL from unauthenticated wifi client

May 12, 2021

References

cert-portal.siemens.com / productcert/html/ssa-019200.html
cert-portal.siemens.com / productcert/html/ssa-913875.html
cert-portal.siemens.com / productcert/pdf/ssa-913875.pdf
PatchThird Party Advisory
github.com / vanhoefm/fragattacks/blob/master/SUMMARY.md
Third Party Advisory
lists.debian.org / debian-lts-announce/2021/06/msg00019.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/06/msg00020.html
Mailing ListThird Party Advisory
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu
Third Party Advisory
arista.com / en/support/advisories-notices/security-advisories/12602-security-advisory-63
Third Party Advisory
fragattacks.com
Third Party Advisory
openwall.com / lists/oss-security/2021/05/11/12
Mailing ListThird Party Advisory