CVE-2023-53879: NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field that allow

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-53879 is a medium-severity flaw (CVSS 5.5) affecting nvclient. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field that allows attackers to crash the application. Attackers can overwrite 846 bytes of memory by pasting a crafted payload into the contact box, causing a denial of service condition.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2025-12-15
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: eyemaxsystems

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

Am I affected?

Timeline

2025-12-15 21:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

eyemaxsystems nvclient DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison nvclient sudo apt install nvclient=<VERSION_BEFORE_5.0> sudo apt-mark hold nvclient

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

dnf --showduplicates list nvclient sudo dnf downgrade nvclient-<VERSION_BEFORE_5.0> sudo dnf versionlock add nvclient

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-2023-53879?

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

Is CVE-2023-53879 being exploited?

CVE-2023-53879 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-2023-53879 affect?

CVE-2023-53879 affects nvclient. Severity is medium (CVSS 5.5). NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field that allows attackers to crash the application. Attackers can overwrite 846 bytes of memory by pasting a crafted payload into the contact bo

How urgent is CVE-2023-53879?

Priority 27/100. Public exploit reference

References

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