CVE-2019-25327Public exploit

Local code execution via SEH overwrite

Published Feb 12, 2026 · Updated Feb 12, 2026

Heap-based buffer overflow in Prime95 29.8 by Mersenne Research, Inc. allows local users to execute arbitrary code through crafted PrimeNet input. The PrimeNet user ID, computer name, and proxy host fields accept oversized data that overwrites SEH through libhwloc-15.dll and redirects execution to supplied shellcode. Exploitation requires a user to paste the generated payload into the Windows GUI and submit the connection settings; the published artifact opens a bind shell on port 3110.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Prime95 29.8 by Mersenne Research, Inc. allows local users to execute arbitrary code through crafted PrimeNet input. The PrimeNet user ID, computer name, and proxy host fields accept oversized data that overwrites SEH through libhwloc-15.dll and redirects execution to supplied shellcode. Exploitation requires a user to paste the generated payload into the Windows GUI and submit the connection settings; the published artifact opens a bind shell on port 3110.

The record

CVE
CVE-2019-25327
Published
Feb 12, 2026
Updated
Feb 12, 2026
Vendor
Mersenne Research, Inc.
Product
Prime95
Classifications
CWE-122, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=29.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mersenne Research, Inc. · Prime95version=29.8

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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