CVE-2023-43628: An integer underflow vulnerability exists in the NTRIP Stream Parsing functionality of GPSd 3.25.1~dev

This week

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2023-43628 is a medium-severity flaw (CVSS 5.9) affecting gpsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An integer underflow vulnerability exists in the NTRIP Stream Parsing functionality of GPSd 3.25.1~dev. A specially crafted network packet can lead to memory corruption. An attacker can send a malicious packet to trigger this vulnerability.

Why this priority

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	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-191
Published	2023-12-05
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: gpsd project

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

Am I affected?

Timeline

2023-12-05 12:15 UTCPublished CVE record published
2026-06-17 06:26 UTCUpdated Record last modified

gpsd project gpsd DOWNGRADE

Affected: 3.25.1 dev

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.25.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.25.1 (Debian / Ubuntu)

apt-cache madison gpsd sudo apt install gpsd=<VERSION_BEFORE_3.25.1> sudo apt-mark hold gpsd

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

dnf --showduplicates list gpsd sudo dnf downgrade gpsd-<VERSION_BEFORE_3.25.1> sudo dnf versionlock add gpsd

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-2023-43628?

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

Is CVE-2023-43628 being exploited?

CVE-2023-43628 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-2023-43628 affect?

CVE-2023-43628 affects gpsd. Severity is medium (CVSS 5.9). An integer underflow vulnerability exists in the NTRIP Stream Parsing functionality of GPSd 3.25.1~dev. A specially crafted network packet can lead to memory corruption. An attacker can send a malicious packet to trigger this vulnerability.

How urgent is CVE-2023-43628?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2025-67269 HIGH 7.5 UPGRADE An integer underflow vulnerability exists in the `nextstate()` function in `gpsd/packet.c` of gpsd versions pr
CVE-2025-67268 CRITICAL 9.8 UPGRADE gpsd before commit dc966aa contains a heap-based out-of-bounds write vulnerability in the drivers/driver_nmea2
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References

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