CVE-2018-25299

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-04-29. NVD baseline CVSS 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
54(Track*)
EG Risk 54/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
5.9%
KEV
Not listed

Published

April 29, 2026

Last Modified

April 30, 2026

Advisory Details (4)

Auto-updated Apr 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Prime95 29.4b8 Local Buffer Overflow via SEH | Advisories | VulnCheck

https://www.vulncheck.com/advisories/prime95-29-4b8-local-buffer-overflow-via-seh
generic

GIMPS - Free Prime95 software downloads - PrimeNet

https://www.mersenne.org/download/#download
generic

Great Internet Mersenne Prime Search - PrimeNet

https://www.mersenne.org/
generic🟡 PoC Available

Prime95 29.4b8 - Stack Buffer Overflow (SEH) - Windows local Exploit

https://www.exploit-db.com/exploits/44649

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 156 total refreshes for this CVE.

  1. 2026-07-23 01:36 UTCEG score recompute
  2. 2026-07-22 22:16 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-20 17:04 UTCEPSS rescore
  7. 2026-07-19 14:28 UTCEPSS rescore
  8. 2026-07-19 02:26 UTCEPSS rescore
  9. 2026-07-19 02:26 UTCEPSS rescore
  10. 2026-07-16 16:59 UTCEPSS rescore
  11. 2026-07-16 16:59 UTCEPSS rescore
  12. 2026-07-15 16:55 UTCEPSS rescore
  13. 2026-07-15 16:55 UTCEPSS rescore
  14. 2026-07-15 01:56 UTCEPSS rescore
  15. 2026-07-15 01:56 UTCEPSS rescore
  16. 2026-07-13 22:27 UTCEPSS rescore
  17. 2026-07-13 22:26 UTCEPSS rescore
  18. 2026-07-13 06:10 UTCEPSS rescore
  19. 2026-07-11 08:24 UTCEPSS rescore
  20. 2026-07-09 19:06 UTCEPSS rescore
  21. 2026-07-08 15:11 UTCEPSS rescore
  22. 2026-07-07 13:42 UTCEPSS rescore
  23. 2026-07-07 13:42 UTCEPSS rescore
  24. 2026-07-06 16:24 UTCEPSS rescore
  25. 2026-07-06 16:24 UTCEPSS rescore
Show 75 more
  1. 2026-07-05 02:27 UTCEPSS rescore
  2. 2026-07-04 06:28 UTCEPSS rescore
  3. 2026-07-04 06:28 UTCEPSS rescore
  4. 2026-07-02 16:54 UTCEPSS rescore
  5. 2026-07-01 15:03 UTCEPSS rescore
  6. 2026-07-01 15:03 UTCEPSS rescore
  7. 2026-06-30 23:20 UTCEPSS rescore
  8. 2026-06-30 23:19 UTCEPSS rescore
  9. 2026-06-29 14:03 UTCEPSS rescore
  10. 2026-06-28 14:04 UTCEPSS rescore
  11. 2026-06-28 04:53 UTCEPSS rescore
  12. 2026-06-28 04:53 UTCEPSS rescore
  13. 2026-06-27 03:06 UTCEPSS rescore
  14. 2026-06-27 03:06 UTCEPSS rescore
  15. 2026-06-25 13:47 UTCEPSS rescore
  16. 2026-06-25 13:47 UTCEPSS rescore
  17. 2026-06-24 14:02 UTCEPSS rescore
  18. 2026-06-24 14:02 UTCEPSS rescore
  19. 2026-06-23 21:30 UTCEPSS rescore
  20. 2026-06-23 21:30 UTCEPSS rescore
  21. 2026-06-23 21:30 UTCEPSS rescore
  22. 2026-06-22 14:23 UTCEPSS rescore
  23. 2026-06-21 14:54 UTCEPSS rescore
  24. 2026-06-21 14:54 UTCEPSS rescore
  25. 2026-06-21 01:57 UTCEPSS rescore
  26. 2026-06-21 01:57 UTCEPSS rescore
  27. 2026-06-19 19:23 UTCEPSS rescore
  28. 2026-06-19 19:23 UTCEPSS rescore
  29. 2026-06-18 17:50 UTCEPSS rescore
  30. 2026-06-18 17:50 UTCEPSS rescore
  31. 2026-06-17 17:50 UTCEPSS rescore
  32. 2026-06-17 17:50 UTCEPSS rescore
  33. 2026-06-16 17:50 UTCEPSS rescore
  34. 2026-06-16 17:50 UTCEPSS rescore
  35. 2026-06-15 17:45 UTCEPSS rescore
  36. 2026-06-14 23:15 UTCEPSS rescore
  37. 2026-06-14 23:14 UTCEPSS rescore
  38. 2026-06-14 22:41 UTCGHSA enrichment
  39. 2026-06-14 09:24 UTCGHSA enrichment
  40. 2026-06-13 22:58 UTCEPSS rescore
  41. 2026-06-12 23:09 UTCEPSS rescore
  42. 2026-06-12 23:09 UTCEPSS rescore
  43. 2026-06-12 07:33 UTCGHSA enrichment
  44. 2026-06-11 18:29 UTCGHSA enrichment
  45. 2026-06-11 13:57 UTCEPSS rescore
  46. 2026-06-11 05:32 UTCGHSA enrichment
  47. 2026-06-10 22:16 UTCEPSS rescore
  48. 2026-06-10 15:23 UTCGHSA enrichment
  49. 2026-06-10 13:19 UTCEPSS rescore
  50. 2026-06-10 02:25 UTCGHSA enrichment
  51. 2026-06-09 13:28 UTCGHSA enrichment
  52. 2026-06-09 00:32 UTCGHSA enrichment
  53. 2026-06-08 14:14 UTCEPSS rescore
  54. 2026-06-08 14:14 UTCEPSS rescore
  55. 2026-06-08 11:34 UTCGHSA enrichment
  56. 2026-06-07 22:37 UTCGHSA enrichment
  57. 2026-06-07 09:41 UTCGHSA enrichment
  58. 2026-06-06 20:44 UTCGHSA enrichment
  59. 2026-06-06 13:45 UTCEPSS rescore
  60. 2026-06-06 13:45 UTCEPSS rescore
  61. 2026-06-06 07:47 UTCGHSA enrichment
  62. 2026-06-05 22:45 UTCEPSS rescore
  63. 2026-06-05 22:45 UTCEPSS rescore
  64. 2026-06-05 18:34 UTCGHSA enrichment
  65. 2026-06-05 05:37 UTCGHSA enrichment
  66. 2026-06-04 16:37 UTCGHSA enrichment
  67. 2026-06-04 13:10 UTCEPSS rescore
  68. 2026-06-04 03:36 UTCGHSA enrichment
  69. 2026-06-03 14:39 UTCGHSA enrichment
  70. 2026-06-03 01:40 UTCGHSA enrichment
  71. 2026-06-02 20:11 UTCEPSS rescore
  72. 2026-06-02 20:11 UTCEPSS rescore
  73. 2026-06-02 12:43 UTCGHSA enrichment
  74. 2026-06-01 23:46 UTCGHSA enrichment
  75. 2026-06-01 13:50 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-25299?
CVE-2018-25299 is a high vulnerability published on April 29, 2026. 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…
When was CVE-2018-25299 disclosed?
CVE-2018-25299 was first published in the National Vulnerability Database on April 29, 2026, with the most recent update on April 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-25299 actively exploited?
CVE-2018-25299 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-25299?
CVE-2018-25299 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2018-25299?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-25299, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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