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CVE-2021-4076

25
FAUCET Score

CVE-2021-4076 describes a critical flaw in the tang network-based cryptographic binding server, potentially leading to the leakage of private keys. With a CVSS score of 7.5 (High), this vulnerability is remotely exploitable with low attack complexity, allowing unauthorized disclosure of sensitive information. While the risk score is 51/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8, < 11CPE matchmatch criteria
cpe:2.3:a:tang_project:tang:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.56%
Probability of exploitation in next 30 days
EPSS Percentile
72.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0156 is in the 55th percentile among its peer group of 51,485 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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 (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2021-4076Moderate

tang: private key leak

Dec 7, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9
PatchThird Party Advisory
github.com / latchset/tang/pull/81
Issue TrackingPatchThird Party Advisory