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CVE-2020-7451

15
FAUCET Score

CVE-2020-7451 is a medium-severity vulnerability affecting FreeBSD 11.3 and 12.1 versions, where a flaw in TCP SYN-ACK or challenge TCP-ACK segment transmission over IPv6 can lead to the disclosure of one byte of kernel memory over the network. This unauthenticated, low-complexity vulnerability allows an attacker to remotely access sensitive information. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
11.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:*
11.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.3:p1:*:*:*:*:*:*
11.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.3:p2:*:*:*:*:*:*
11.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.3:p3:*:*:*:*:*:*
11.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.3:p4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 41st percentile among its peer group of 23,705 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

security.freebsd.org / advisories/FreeBSD-SA-20:04.tcp.asc
PatchVendor Advisory