CVE-2022-43343: N-Prolog v1.91 was discovered to contain a global buffer overflow vulnerability in the function gettoken() at

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2022-43343 is a high-severity flaw (CVSS 7.5) affecting n-prolog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

N-Prolog v1.91 was discovered to contain a global buffer overflow vulnerability in the function gettoken() at Main.c.

Why this priority

High severity
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-120
Published	2022-11-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: n-prolog project

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

Am I affected?

Timeline

2022-11-08 15:15 UTCPublished CVE record published
2026-06-17 05:06 UTCUpdated Record last modified

n-prolog project n-prolog DOWNGRADE

Affected: 1.91

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.91

1. Check installed version

apt-cache policy n-prolog || rpm -q n-prolog || n-prolog --version

2. No fixed release: DOWNGRADE to a release before 1.91 (Debian / Ubuntu)

apt-cache madison n-prolog sudo apt install n-prolog=<VERSION_BEFORE_1.91> sudo apt-mark hold n-prolog

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

dnf --showduplicates list n-prolog sudo dnf downgrade n-prolog-<VERSION_BEFORE_1.91> sudo dnf versionlock add n-prolog

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-2022-43343?

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

Is CVE-2022-43343 being exploited?

CVE-2022-43343 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-2022-43343 affect?

CVE-2022-43343 affects n-prolog. Severity is high (CVSS 7.5). N-Prolog v1.91 was discovered to contain a global buffer overflow vulnerability in the function gettoken() at Main.c.

How urgent is CVE-2022-43343?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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