CVE-2022-30055: Prime95 30.7 build 9 suffers from a Buffer Overflow vulnerability that could lead to Remote Code Execution.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-30055 is a critical-severity flaw (CVSS 9.8) affecting prime95. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Prime95 30.7 build 9 suffers from a Buffer Overflow vulnerability that could lead to Remote Code Execution.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-120
Published	2022-05-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mersenne

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

Am I affected?

Timeline

2022-05-16 17:15 UTCPublished CVE record published
2026-06-17 04:43 UTCUpdated Record last modified

mersenne prime95 DOWNGRADE

Affected: 30.7 build9

Fixed in: no fixed release known

Safe to downgrade to: a release before 30.7

1. Check installed version

apt-cache policy prime95 || rpm -q prime95 || prime95 --version

2. No fixed release: DOWNGRADE to a release before 30.7 (Debian / Ubuntu)

apt-cache madison prime95 sudo apt install prime95=<VERSION_BEFORE_30.7> sudo apt-mark hold prime95

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list prime95 sudo dnf downgrade prime95-<VERSION_BEFORE_30.7> sudo dnf versionlock add prime95

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-30055?

prime95: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-30055 being exploited?

CVE-2022-30055 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-2022-30055 affect?

CVE-2022-30055 affects prime95. Severity is critical (CVSS 9.8). Prime95 30.7 build 9 suffers from a Buffer Overflow vulnerability that could lead to Remote Code Execution.

How urgent is CVE-2022-30055?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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