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CVE-2018-20684

Status: ModifiedHigh (7.5)—
Severity7.5High · CVSS 3.0
Exploitation probability2.77 %higher than 86% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept arbitrary files sent by the server, potentially overwriting unrelated files. This affects TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp.

CVSS

Base score
7.5
Version
3.0
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
2.77 %
Percentile among all scored CVEs
86
Score date
10/24/2026

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).

Affected technologies (1)

Winscp — Winscp

CWEs

References

Show 12 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2018-20684",
  "cveTags": [],
  "metrics": {
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          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
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          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
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      }
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    "cvssMetricV30": [
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        "cvssData": {
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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  "published": "2019-01-10T21:29:00.297",
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      "tags": [
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    {
      "url": "https://github.com/winscp/winscp/commit/49d876f2c5fc00bcedaa986a7cf6dedd6bf16f54",
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
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    {
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      "source": "cve@mitre.org"
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    {
      "url": "https://www.oracle.com/security-alerts/cpujan2020.html",
      "source": "cve@mitre.org"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://www.oracle.com/security-alerts/cpujan2020.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
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          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept arbitrary files sent by the server, potentially overwriting unrelated files. This affects TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp."
    },
    {
      "lang": "es",
      "value": "En WinSCP, en versiones anteriores a la 5.14 beta, debido a la falta de validación, la implementación de scp aceptaría archivos arbitrarios enviados por el servidor, lo que podría sobrescribir archivos no relacionados. Esto afecta a TSCPFileSystem::SCPSink en core/ScpFileSystem.cpp."
    }
  ],
  "lastModified": "2026-06-17T01:53:19.183",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "C13D4EFE-E54E-4E74-998E-590660C121CF",
              "versionEndIncluding": "5.13.7"
            }
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          "operator": "OR"
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  ],
  "sourceIdentifier": "cve@mitre.org"
}