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CVE-2023-4590

Status: ModifiedCritical (9.8)—PoC
Severity9.8Critical · CVSS 3.1
Exploitation probability1.10 %higher than 65% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailableProof of concept on GitHub (unverified)

Buffer overflow vulnerability in Frhed hex editor, affecting version 1.6.0. This vulnerability could allow an attacker to execute arbitrary code via a long filename argument through the Structured Exception Handler (SEH) registers.

CVSS

Base score
9.8
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.10 %
Percentile among all scored CVEs
65
Score date
10/27/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Kimmov — Frhed

CWEs

References

Show 2 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2023-4590",
  "cveTags": [],
  "metrics": {
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  "affected": [
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      "affectedData": [
        {
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          "product": "Frhed ",
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  "published": "2023-11-27T13:15:07.130",
  "references": [
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      "url": "https://www.incibe.es/en/incibe-cert/notices/aviso/buffer-overflow-vulnerability-frhed",
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      "lang": "en",
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    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de desbordamiento del búfer en el editor hexadecimal Frhed, que afecta a la versión 1.6.0. Esta vulnerabilidad podría permitir a un atacante ejecutar código arbitrario a través de un argumento de nombre de archivo largo a través de los registros de Structured Exception Handler (SEH)."
    }
  ],
  "lastModified": "2026-06-17T06:38:10.240",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "cve-coordination@incibe.es"
}