CVE-2018-25299 — Prime95 29.4b8 Local Buffer Overflow via SEH

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HIGH

Prime95 29.4b8 Local Buffer Overflow via SEH

Published Apr 29, 2026

8.6

HIGH

CVSS 4.0

EPSS 0.16%

Description

Prime95 29.4b8 contains a local buffer overflow vulnerability that allows attackers to execute arbitrary code by exploiting structured exception handling (SEH) mechanisms. Attackers can inject malicious payload through the optional proxy hostname field in the PrimeNet connection settings to trigger the overflow and execute system commands.

Affected products

Vendor Mersenne Product Prime95 Default
n/a
- Version
  29.4b8
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mersenne

Prime95

n/a

Version	Status	Constraints
29.4b8	affected	-

Remediation

No remediation recorded yet.

Metrics

0.16% 0.00162

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00162

Score over time

Apr–Oct 2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	0.16% (0.00162)	4.79th	v5 (v2026.06.15)
Jun 15, 2026	0.16% (0.00162)	5.75th	v5 (v2026.06.15)
Apr 30, 2026	0.01% (0.00013)	2.41th	v4 (v2025.03.14)

Weaknesses (1)

CWE-120

Classic Buffer Overflow

References (4)

https://www.exploit-db.com/exploits/44649
exploit
https://www.mersenne.org/
product
https://www.mersenne.org/download/#download
product
https://www.vulncheck.com/advisories/prime95-29-4b8-local-buffer-overflow-via-seh
third-party-advisory

Link	Providers	Tags
https://www.exploit-db.com/exploits/44649		exploit
https://www.mersenne.org/		product
https://www.mersenne.org/download/#download		product
https://www.vulncheck.com/advisories/prime95-29-4b8-local-buffer-overflow-via-seh		third-party-advisory