CVE-2025-3845: A vulnerability was found in markparticle WebServer up to 1.0

This month

HIGH 7.3REMOTEMITIGATE

CVE-2025-3845 is a high-severity flaw (CVSS 7.3) affecting webserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in markparticle WebServer up to 1.0. It has been declared as critical. Affected by this vulnerability is the function Buffer::HasWritten of the file code/buffer/buffer.cpp. The manipulation of the argument writePos_ leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-04-21
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: markparticle

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

Am I affected?

Timeline

2025-04-21 22:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

markparticle webserver MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2025-3845?

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

Is CVE-2025-3845 being exploited?

CVE-2025-3845 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-2025-3845 affect?

CVE-2025-3845 affects webserver. Severity is high (CVSS 7.3). A vulnerability was found in markparticle WebServer up to 1.0. It has been declared as critical. Affected by this vulnerability is the function Buffer::HasWritten of the file code/buffer/buffer.cpp. The manipulation of the argument writePos

How urgent is CVE-2025-3845?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-3847 HIGH 7.3 MITIGATE A vulnerability classified as critical has been found in markparticle WebServer up to 1.0
CVE-2025-3846 HIGH 7.3 MITIGATE A vulnerability was found in markparticle WebServer up to 1.0
CVE-2024-11215 MEDIUM 6.5 DOWNGRADE Absolute path traversal (incorrect restriction of a path to a restricted directory) vulnerability in the EasyP
CVE-2023-53944 MEDIUM 6.5 DOWNGRADE EasyPHP Webserver 14.1 contains a path traversal vulnerability that allows remote users with low privileges to
CVE-2023-53941 CRITICAL 9.8 DOWNGRADE EasyPHP Webserver 14.1 contains an OS command injection vulnerability that allows unauthenticated attackers to

References

← Back to latest CVEs