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CVE-2018-20503

Status: ModifiedMedium (6.1)—Exploit
Severity6.1Medium · CVSS 3.0
Exploitation probability3.90 %higher than 90% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailablePublished on Exploit-DB

Allied Telesis 8100L/8 devices allow XSS via the edit-ipv4_interface.php vlanid or subnet_mask parameter.

CVSS

Base score
6.1
Version
3.0
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.90 %
Percentile among all scored CVEs
90
Score date
10/22/2026

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.

Affected technologies (1)

Alliedtelesis — 8100l/8 Firmware

CWEs

References

Show 6 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2018-20503",
  "cveTags": [],
  "metrics": {
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        "cvssData": {
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          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
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    "cvssMetricV30": [
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          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
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      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
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  ],
  "published": "2019-05-07T19:29:00.537",
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    },
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      "url": "http://packetstormsecurity.com/files/151327/SirsiDynix-e-Library-3.5.x-Cross-Site-Scripting.html",
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        "VDB Entry"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://pentest.com.tr/exploits/Allied-Telesis-8100L-8-Cross-Site-Scripting.html",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Allied Telesis 8100L/8 devices allow XSS via the edit-ipv4_interface.php vlanid or subnet_mask parameter."
    },
    {
      "lang": "es",
      "value": "Los dispositivos Allied Telesis 8100L/8 permiten XSS a través del parámetro edit-ipv4_interface.php vlanid o subnet_mask."
    }
  ],
  "lastModified": "2026-06-17T01:52:59.230",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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      "operator": "AND"
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  ],
  "sourceIdentifier": "cve@mitre.org"
}