How severe is CVE-2021-4076?

CVE-2021-4076 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-4076 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4076?

CVE-2021-4076 affects Tang Project Tang. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4076?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-4076 published?

CVE-2021-4076 was published on 2022-03-02 and last updated on 2026-06-17.

CVE-2021-4076

CVE-2021-4076 is a high-severity vulnerability in Tang Project Tang with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Tang Project Tang
Published: 2022-03-02
Last modified: 2026-06-17

Description

A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.

Frequently asked questions

What is CVE-2021-4076?: A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.
How severe is CVE-2021-4076?: CVE-2021-4076 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-4076 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4076?: CVE-2021-4076 affects Tang Project Tang. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4076?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-4076 published?: CVE-2021-4076 was published on 2022-03-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tang_project:tang:*:*:*:*:*:*:*:*

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