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CVE-2025-20240 (GCVE-0-2025-20240)

Vulnerability from cvelistv5 – Published: 2025-09-24 17:14 – Updated: 2025-09-26 17:12
VLAI Previdian
Summary
A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device. This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-24 17:31 UTC
CWE
  • CWE-692 - Incomplete Blacklist to Cross-Site Scripting
Impacted products
Vendor Product Version CPE status
Cisco Cisco IOS XE Software Affected: 16.6.1
Affected: 16.6.2
Affected: 16.6.3
Affected: 16.6.4
Affected: 16.6.5
Affected: 16.6.4a
Affected: 16.6.5a
Affected: 16.6.6
Affected: 16.6.7
Affected: 16.6.8
Affected: 16.6.9
Affected: 16.6.10
Affected: 16.7.1
Affected: 16.7.1a
Affected: 16.7.1b
Affected: 16.7.2
Affected: 16.7.3
Affected: 16.7.4
Affected: 16.8.1
Affected: 16.8.1a
Affected: 16.8.1b
Affected: 16.8.1s
Affected: 16.8.1c
Affected: 16.8.1d
Affected: 16.8.2
Affected: 16.8.1e
Affected: 16.8.3
Affected: 16.9.1
Affected: 16.9.2
Affected: 16.9.1a
Affected: 16.9.1b
Affected: 16.9.1s
Affected: 16.9.3
Affected: 16.9.4
Affected: 16.9.3a
Affected: 16.9.5
Affected: 16.9.5f
Affected: 16.9.6
Affected: 16.9.7
Affected: 16.9.8
Affected: 16.10.1
Affected: 16.10.1a
Affected: 16.10.1b
Affected: 16.10.1s
Affected: 16.10.1c
Affected: 16.10.1e
Affected: 16.10.1d
Affected: 16.10.2
Affected: 16.10.1f
Affected: 16.10.1g
Affected: 16.10.3
Affected: 16.11.1
Affected: 16.11.1a
Affected: 16.11.1b
Affected: 16.11.2
Affected: 16.11.1s
Affected: 16.12.1
Affected: 16.12.1s
Affected: 16.12.1a
Affected: 16.12.1c
Affected: 16.12.1w
Affected: 16.12.2
Affected: 16.12.1y
Affected: 16.12.2a
Affected: 16.12.3
Affected: 16.12.8
Affected: 16.12.2s
Affected: 16.12.1x
Affected: 16.12.1t
Affected: 16.12.4
Affected: 16.12.3s
Affected: 16.12.3a
Affected: 16.12.4a
Affected: 16.12.5
Affected: 16.12.6
Affected: 16.12.1z1
Affected: 16.12.5a
Affected: 16.12.5b
Affected: 16.12.1z2
Affected: 16.12.6a
Affected: 16.12.7
Affected: 16.12.9
Affected: 16.12.10
Affected: 16.12.10a
Affected: 16.12.11
Affected: 16.12.12
Affected: 16.12.13
Affected: 17.1.1
Affected: 17.1.1a
Affected: 17.1.1s
Affected: 17.1.1t
Affected: 17.1.3
Affected: 17.2.1
Affected: 17.2.1r
Affected: 17.2.1a
Affected: 17.2.1v
Affected: 17.2.2
Affected: 17.2.3
Affected: 17.3.1
Affected: 17.3.2
Affected: 17.3.3
Affected: 17.3.1a
Affected: 17.3.1w
Affected: 17.3.2a
Affected: 17.3.1x
Affected: 17.3.1z
Affected: 17.3.4
Affected: 17.3.5
Affected: 17.3.4a
Affected: 17.3.6
Affected: 17.3.4b
Affected: 17.3.4c
Affected: 17.3.5a
Affected: 17.3.5b
Affected: 17.3.7
Affected: 17.3.8
Affected: 17.3.8a
Affected: 17.4.1
Affected: 17.4.2
Affected: 17.4.1a
Affected: 17.4.1b
Affected: 17.4.2a
Affected: 17.5.1
Affected: 17.5.1a
Affected: 17.6.1
Affected: 17.6.2
Affected: 17.6.1w
Affected: 17.6.1a
Affected: 17.6.1x
Affected: 17.6.3
Affected: 17.6.1y
Affected: 17.6.1z
Affected: 17.6.3a
Affected: 17.6.4
Affected: 17.6.1z1
Affected: 17.6.5
Affected: 17.6.6
Affected: 17.6.6a
Affected: 17.6.5a
Affected: 17.6.7
Affected: 17.6.8
Affected: 17.6.8a
Affected: 17.7.1
Affected: 17.7.1a
Affected: 17.7.1b
Affected: 17.7.2
Affected: 17.10.1
Affected: 17.10.1a
Affected: 17.10.1b
Affected: 17.8.1
Affected: 17.8.1a
Affected: 17.9.1
Affected: 17.9.1w
Affected: 17.9.2
Affected: 17.9.1a
Affected: 17.9.1x
Affected: 17.9.1y
Affected: 17.9.3
Affected: 17.9.2a
Affected: 17.9.1x1
Affected: 17.9.3a
Affected: 17.9.4
Affected: 17.9.1y1
Affected: 17.9.5
Affected: 17.9.4a
Affected: 17.9.5a
Affected: 17.9.5b
Affected: 17.9.6
Affected: 17.9.6a
Affected: 17.9.7
Affected: 17.9.5e
Affected: 17.9.5f
Affected: 17.9.7a
Affected: 17.9.7b
Affected: 17.11.1
Affected: 17.11.1a
Affected: 17.12.1
Affected: 17.12.1w
Affected: 17.12.1a
Affected: 17.12.1x
Affected: 17.12.2
Affected: 17.12.3
Affected: 17.12.2a
Affected: 17.12.1y
Affected: 17.12.1z
Affected: 17.12.4
Affected: 17.12.3a
Affected: 17.12.1z1
Affected: 17.12.1z2
Affected: 17.12.4a
Affected: 17.12.5
Affected: 17.12.4b
Affected: 17.12.1z3
Affected: 17.12.5a
Affected: 17.12.1z4
Affected: 17.12.5b
Affected: 17.12.5c
Affected: 17.13.1
Affected: 17.13.1a
Affected: 17.14.1
Affected: 17.14.1a
Affected: 17.15.1
Affected: 17.15.1w
Affected: 17.15.1a
Affected: 17.15.2
Affected: 17.15.1b
Affected: 17.15.1x
Affected: 17.15.3
Affected: 17.15.2c
Affected: 17.15.2a
Affected: 17.15.1y
Affected: 17.15.2b
Affected: 17.15.3a
Affected: 17.15.3b
Affected: 17.16.1
Affected: 17.16.1a
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Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-20240

Status: Confirmed

Status Updated: 2025-09-25 11:38 UTC

Exploited: Yes


Timestamps
First Seen: 2025-09-25
Asserted: 2025-09-25

Scope
Notes: KEVIntel entry: A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected... | Affected: Cisco / Cisco IOS XE Software | CVSS: 6.1 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected...
Vendor Cisco
Product Cisco IOS XE Software
Added Date 2025-09-25T11:38:17.000Z
Cvss Score 6.1
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website

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            {
              "status": "affected",
              "version": "17.6.7"
            },
            {
              "status": "affected",
              "version": "17.6.8"
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              "status": "affected",
              "version": "17.6.8a"
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              "status": "affected",
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              "version": "17.7.2"
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              "status": "affected",
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              "status": "affected",
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              "version": "17.9.1"
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              "version": "17.12.1z4"
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              "status": "affected",
              "version": "17.12.5b"
            },
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              "status": "affected",
              "version": "17.12.5c"
            },
            {
              "status": "affected",
              "version": "17.13.1"
            },
            {
              "status": "affected",
              "version": "17.13.1a"
            },
            {
              "status": "affected",
              "version": "17.14.1"
            },
            {
              "status": "affected",
              "version": "17.14.1a"
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            {
              "status": "affected",
              "version": "17.15.1"
            },
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              "status": "affected",
              "version": "17.15.1w"
            },
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              "version": "17.15.1a"
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              "status": "affected",
              "version": "17.15.2"
            },
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              "status": "affected",
              "version": "17.15.1b"
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              "status": "affected",
              "version": "17.15.1x"
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              "status": "affected",
              "version": "17.15.3"
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            {
              "status": "affected",
              "version": "17.15.2c"
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              "status": "affected",
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              "status": "affected",
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device.\r\n\r This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-692",
              "description": "Incomplete Blacklist to Cross-Site Scripting",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-26T17:12:35.657Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-webui-xss-VWyDgjOU",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-xss-VWyDgjOU"
        }
      ],
      "source": {
        "advisory": "cisco-sa-webui-xss-VWyDgjOU",
        "defects": [
          "CSCwm57073"
        ],
        "discovery": "EXTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2025-20240",
    "datePublished": "2025-09-24T17:14:34.470Z",
    "dateReserved": "2024-10-10T19:15:13.238Z",
    "dateUpdated": "2025-09-26T17:12:35.657Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-20240",
      "date": "2026-09-20",
      "epss": "0.0029",
      "percentile": "0.21775"
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                },
                {
                  "status": "affected",
                  "version": "17.9.7a"
                },
                {
                  "status": "affected",
                  "version": "17.9.7b"
                },
                {
                  "status": "affected",
                  "version": "17.11.1"
                },
                {
                  "status": "affected",
                  "version": "17.11.1a"
                },
                {
                  "status": "affected",
                  "version": "17.12.1"
                },
                {
                  "status": "affected",
                  "version": "17.12.1w"
                },
                {
                  "status": "affected",
                  "version": "17.12.1a"
                },
                {
                  "status": "affected",
                  "version": "17.12.1x"
                },
                {
                  "status": "affected",
                  "version": "17.12.2"
                },
                {
                  "status": "affected",
                  "version": "17.12.3"
                },
                {
                  "status": "affected",
                  "version": "17.12.2a"
                },
                {
                  "status": "affected",
                  "version": "17.12.1y"
                },
                {
                  "status": "affected",
                  "version": "17.12.1z"
                },
                {
                  "status": "affected",
                  "version": "17.12.4"
                },
                {
                  "status": "affected",
                  "version": "17.12.3a"
                },
                {
                  "status": "affected",
                  "version": "17.12.1z1"
                },
                {
                  "status": "affected",
                  "version": "17.12.1z2"
                },
                {
                  "status": "affected",
                  "version": "17.12.4a"
                },
                {
                  "status": "affected",
                  "version": "17.12.5"
                },
                {
                  "status": "affected",
                  "version": "17.12.4b"
                },
                {
                  "status": "affected",
                  "version": "17.12.1z3"
                },
                {
                  "status": "affected",
                  "version": "17.12.5a"
                },
                {
                  "status": "affected",
                  "version": "17.12.1z4"
                },
                {
                  "status": "affected",
                  "version": "17.12.5b"
                },
                {
                  "status": "affected",
                  "version": "17.12.5c"
                },
                {
                  "status": "affected",
                  "version": "17.13.1"
                },
                {
                  "status": "affected",
                  "version": "17.13.1a"
                },
                {
                  "status": "affected",
                  "version": "17.14.1"
                },
                {
                  "status": "affected",
                  "version": "17.14.1a"
                },
                {
                  "status": "affected",
                  "version": "17.15.1"
                },
                {
                  "status": "affected",
                  "version": "17.15.1w"
                },
                {
                  "status": "affected",
                  "version": "17.15.1a"
                },
                {
                  "status": "affected",
                  "version": "17.15.2"
                },
                {
                  "status": "affected",
                  "version": "17.15.1b"
                },
                {
                  "status": "affected",
                  "version": "17.15.1x"
                },
                {
                  "status": "affected",
                  "version": "17.15.3"
                },
                {
                  "status": "affected",
                  "version": "17.15.2c"
                },
                {
                  "status": "affected",
                  "version": "17.15.2a"
                },
                {
                  "status": "affected",
                  "version": "17.15.1y"
                },
                {
                  "status": "affected",
                  "version": "17.15.2b"
                },
                {
                  "status": "affected",
                  "version": "17.15.3a"
                },
                {
                  "status": "affected",
                  "version": "17.15.3b"
                },
                {
                  "status": "affected",
                  "version": "17.16.1"
                },
                {
                  "status": "affected",
                  "version": "17.16.1a"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device.\r\n\r This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                "version": "3.1"
              },
              "format": "cvssV3_1"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-692",
                  "description": "Incomplete Blacklist to Cross-Site Scripting",
                  "lang": "en",
                  "type": "cwe"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-09-26T17:12:35.657Z",
            "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
            "shortName": "cisco"
          },
          "references": [
            {
              "name": "cisco-sa-webui-xss-VWyDgjOU",
              "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-xss-VWyDgjOU"
            }
          ],
          "source": {
            "advisory": "cisco-sa-webui-xss-VWyDgjOU",
            "defects": [
              "CSCwm57073"
            ],
            "discovery": "EXTERNAL"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "assignerShortName": "cisco",
        "cveId": "CVE-2025-20240",
        "datePublished": "2025-09-24T17:14:34.470Z",
        "dateReserved": "2024-10-10T19:15:13.238Z",
        "dateUpdated": "2025-09-26T17:12:35.657Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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