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CVE-2020-26142

17
FAUCET Score

CVE-2020-26142 is a medium-severity vulnerability affecting the kernel of OpenBSD 6.6, specifically its WEP, WPA, WPA2, and WPA3 implementations. It allows an unauthenticated, remote attacker to inject arbitrary network packets by misinterpreting fragmented frames as full frames. While the attack complexity is high and user interaction is required, a successful exploit could lead to significant integrity impact. There is no evidence of active exploitation, and public exploit code is unavailable, though it has received some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
6.6CPE matchmatch criteria
cpe:2.3:o:openbsd:openbsd:6.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

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

Exploit Intelligence

EPSS Score
2.08%
Probability of exploitation in next 30 days
EPSS Percentile
79.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0208 is in the 86th percentile among its peer group of 707 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2020-26142Moderate

kernel: processing fragmented frames as full frames

May 11, 2021

References

github.com / vanhoefm/fragattacks/blob/master/SUMMARY.md
Third 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