How severe is CVE-2021-33589?

CVE-2021-33589 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-2021-33589 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33589?

CVE-2021-33589 affects Ribose Rnp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33589?

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-2021-33589 published?

CVE-2021-33589 was published on 2023-04-21 and last updated on 2026-06-17.

CVE-2021-33589

CVE-2021-33589 is a high-severity vulnerability in Ribose Rnp 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Ribose Rnp
Published: 2023-04-21
Last modified: 2026-06-17

Description

Ribose RNP before 0.15.1 does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than on the tin of the algorithm.

Frequently asked questions

What is CVE-2021-33589?: Ribose RNP before 0.15.1 does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than on the tin of the algorithm.
How severe is CVE-2021-33589?: CVE-2021-33589 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-2021-33589 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33589?: CVE-2021-33589 affects Ribose Rnp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33589?: 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-2021-33589 published?: CVE-2021-33589 was published on 2023-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ribose:rnp:*:*:*:*:*:*:*:*

More vulnerabilities in Ribose Rnp

CVE-2023-29480 — High (CVSS 7.5): Ribose RNP before 0.16.3 sometimes lets secret keys remain unlocked after use.
CVE-2023-29479 — Medium (CVSS 5.3): Ribose RNP before 0.16.3 may hang when the input is malformed.

All CVEs affecting Ribose Rnp →

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