CVE-2021-33589: Ribose RNP before 0.15.1 does not implement a required step in a cryptographic algorithm, resulting in weaker

Q: How do I fix CVE-2021-33589?

rnp: upgrade to 0.15.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-33589 being exploited?

CVE-2021-33589 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-33589 affect?

CVE-2021-33589 affects rnp. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2021-33589?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-33589 is a high-severity flaw (CVSS 7.5) affecting rnp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-522
Published	2023-04-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ribose

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-21 12:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

ribose rnp UPGRADE

Affected: < 0.15.1

Fixed in: 0.15.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rnp || rpm -q rnp || rnp --version

2. UPGRADE to 0.15.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rnp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rnp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33589?

rnp: upgrade to 0.15.1. Exact commands for each OS are on this page.

Is CVE-2021-33589 being exploited?

CVE-2021-33589 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33589 affect?

CVE-2021-33589 affects rnp. Severity is high (CVSS 7.5). 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 urgent is CVE-2021-33589?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-29480 HIGH 7.5 UPGRADE Ribose RNP before 0.16.3 sometimes lets secret keys remain unlocked after use.
CVE-2023-29479 MEDIUM 5.3 UPGRADE Ribose RNP before 0.16.3 may hang when the input is malformed.

References

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