CVE-2025-20251 (GCVE-0-2025-20251)

Vulnerability from cvelistv5 – Published: 2025-08-14 16:29 – Updated: 2025-08-14 19:19
VLAI?
Summary
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated, new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped, causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover. This vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to create or delete files on the underlying operating system, which could cause the Remote Access SSL VPN service to become unresponsive. To exploit this vulnerability, the attacker must be authenticated as a VPN user of the affected device.
CWE
  • CWE-1287 - Improper Validation of Specified Type of Input
Assigner
Impacted products
Vendor Product Version
Cisco Cisco Adaptive Security Appliance (ASA) Software Affected: 9.12.3
Affected: 9.8.3
Affected: 9.12.1
Affected: 9.8.1
Affected: 9.12.2
Affected: 9.8.2.45
Affected: 9.8.2
Affected: 9.8.4
Affected: 9.14.1
Affected: 9.12.4
Affected: 9.8.2.26
Affected: 9.8.2.24
Affected: 9.8.2.15
Affected: 9.8.2.14
Affected: 9.8.2.35
Affected: 9.8.2.20
Affected: 9.8.2.8
Affected: 9.8.2.17
Affected: 9.8.2.28
Affected: 9.8.2.33
Affected: 9.8.2.38
Affected: 9.8.4.25
Affected: 9.12.3.2
Affected: 9.12.3.7
Affected: 9.8.3.18
Affected: 9.8.3.14
Affected: 9.8.4.15
Affected: 9.8.4.8
Affected: 9.8.1.7
Affected: 9.8.3.29
Affected: 9.14.1.10
Affected: 9.12.2.5
Affected: 9.8.4.22
Affected: 9.12.3.12
Affected: 9.8.4.7
Affected: 9.8.4.17
Affected: 9.8.3.16
Affected: 9.8.4.20
Affected: 9.8.3.11
Affected: 9.12.1.3
Affected: 9.8.4.3
Affected: 9.12.2.4
Affected: 9.8.4.12
Affected: 9.12.1.2
Affected: 9.8.3.26
Affected: 9.8.1.5
Affected: 9.12.2.9
Affected: 9.12.3.9
Affected: 9.8.3.21
Affected: 9.8.4.10
Affected: 9.12.2.1
Affected: 9.12.4.2
Affected: 9.14.1.6
Affected: 9.8.3.8
Affected: 9.14.1.15
Affected: 9.14.1.19
Affected: 9.8.4.26
Affected: 9.12.4.4
Affected: 9.14.1.30
Affected: 9.8.4.29
Affected: 9.12.4.7
Affected: 9.14.2
Affected: 9.12.4.8
Affected: 9.8.4.32
Affected: 9.12.4.10
Affected: 9.14.2.4
Affected: 9.14.2.8
Affected: 9.12.4.13
Affected: 9.8.4.33
Affected: 9.14.2.13
Affected: 9.8.4.34
Affected: 9.12.4.18
Affected: 9.8.4.35
Affected: 9.14.2.15
Affected: 9.12.4.24
Affected: 9.16.1
Affected: 9.8.4.39
Affected: 9.14.3
Affected: 9.12.4.26
Affected: 9.16.1.28
Affected: 9.14.3.1
Affected: 9.12.4.29
Affected: 9.14.3.9
Affected: 9.16.2
Affected: 9.12.4.30
Affected: 9.16.2.3
Affected: 9.8.4.40
Affected: 9.14.3.11
Affected: 9.12.4.35
Affected: 9.8.4.41
Affected: 9.14.3.13
Affected: 9.16.2.7
Affected: 9.12.4.37
Affected: 9.14.3.15
Affected: 9.17.1
Affected: 9.16.2.11
Affected: 9.14.3.18
Affected: 9.16.2.13
Affected: 9.12.4.39
Affected: 9.12.4.38
Affected: 9.8.4.43
Affected: 9.14.4
Affected: 9.16.2.14
Affected: 9.17.1.7
Affected: 9.12.4.40
Affected: 9.16.3.3
Affected: 9.14.4.6
Affected: 9.16.3
Affected: 9.16.3.14
Affected: 9.17.1.9
Affected: 9.14.4.7
Affected: 9.12.4.41
Affected: 9.17.1.10
Affected: 9.8.4.44
Affected: 9.18.1
Affected: 9.12.4.47
Affected: 9.14.4.12
Affected: 9.16.3.15
Affected: 9.18.1.3
Affected: 9.17.1.11
Affected: 9.12.4.48
Affected: 9.14.4.13
Affected: 9.18.2
Affected: 9.16.3.19
Affected: 9.17.1.13
Affected: 9.12.4.50
Affected: 9.14.4.14
Affected: 9.17.1.15
Affected: 9.8.4.45
Affected: 9.12.4.52
Affected: 9.14.4.15
Affected: 9.16.3.23
Affected: 9.18.2.5
Affected: 9.16.4
Affected: 9.12.4.54
Affected: 9.14.4.17
Affected: 9.8.4.46
Affected: 9.17.1.20
Affected: 9.18.2.7
Affected: 9.19.1
Affected: 9.16.4.9
Affected: 9.12.4.55
Affected: 9.18.2.8
Affected: 9.14.4.22
Affected: 9.16.4.14
Affected: 9.8.4.48
Affected: 9.18.3
Affected: 9.19.1.5
Affected: 9.14.4.23
Affected: 9.12.4.56
Affected: 9.16.4.18
Affected: 9.17.1.30
Affected: 9.19.1.9
Affected: 9.18.3.39
Affected: 9.16.4.19
Affected: 9.12.4.58
Affected: 9.19.1.12
Affected: 9.18.3.46
Affected: 9.16.4.27
Affected: 9.19.1.18
Affected: 9.18.3.53
Affected: 9.18.3.55
Affected: 9.16.4.38
Affected: 9.17.1.33
Affected: 9.12.4.62
Affected: 9.16.4.39
Affected: 9.18.3.56
Affected: 9.20.1
Affected: 9.16.4.42
Affected: 9.19.1.22
Affected: 9.18.4
Affected: 9.20.1.5
Affected: 9.18.4.5
Affected: 9.19.1.24
Affected: 9.16.4.48
Affected: 9.18.4.8
Affected: 9.20.2
Affected: 9.19.1.27
Affected: 9.12.4.65
Affected: 9.16.4.55
Affected: 9.18.4.22
Affected: 9.20.2.10
Affected: 9.16.4.57
Affected: 9.19.1.28
Affected: 9.17.1.39
Affected: 9.12.4.67
Affected: 9.14.4.24
Affected: 9.18.4.24
Affected: 9.20.2.21
Affected: 9.16.4.61
Affected: 9.19.1.31
Affected: 9.18.4.29
Affected: 9.20.2.22
Affected: 9.16.4.62
Affected: 9.18.4.34
Affected: 9.20.3
Affected: 9.16.4.67
Affected: 9.16.4.70
Affected: 9.18.4.40
Affected: 9.23.1
Affected: 9.22.1.1
Affected: 9.16.4.71
Affected: 9.20.3.4
Affected: 9.18.4.47
Affected: 9.20.3.7
Affected: 9.17.1.45
Affected: 9.19.1.37
Affected: 9.17.1.46
Affected: 9.16.4.76
Affected: 9.20.3.9
Affected: 9.19.1.38
Affected: 9.18.4.50
Affected: 9.22.1.3
Affected: 9.20.3.10
Affected: 9.22.1.2
Affected: 9.18.4.52
Affected: 9.20.3.13
Affected: 9.22.1.6
Affected: 9.18.4.53
Affected: 9.16.4.82
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    Cisco Cisco Firepower Threat Defense Software Affected: 6.2.3.14
Affected: 6.4.0.1
Affected: 6.2.3.7
Affected: 6.2.3
Affected: 6.4.0.2
Affected: 6.2.3.9
Affected: 6.2.3.1
Affected: 6.2.3.2
Affected: 6.4.0.5
Affected: 6.2.3.10
Affected: 6.4.0
Affected: 6.4.0.3
Affected: 6.2.3.6
Affected: 6.4.0.4
Affected: 6.2.3.15
Affected: 6.2.3.5
Affected: 6.2.3.4
Affected: 6.2.3.3
Affected: 6.2.3.8
Affected: 6.4.0.6
Affected: 6.2.3.11
Affected: 6.2.3.12
Affected: 6.2.3.13
Affected: 6.4.0.7
Affected: 6.4.0.8
Affected: 6.6.0
Affected: 6.4.0.9
Affected: 6.2.3.16
Affected: 6.6.0.1
Affected: 6.6.1
Affected: 6.4.0.10
Affected: 6.4.0.11
Affected: 6.6.3
Affected: 6.6.4
Affected: 6.4.0.12
Affected: 7.0.0
Affected: 6.2.3.17
Affected: 7.0.0.1
Affected: 6.6.5
Affected: 7.0.1
Affected: 7.1.0
Affected: 6.4.0.13
Affected: 6.6.5.1
Affected: 6.2.3.18
Affected: 7.0.1.1
Affected: 6.4.0.14
Affected: 7.1.0.1
Affected: 6.6.5.2
Affected: 7.0.2
Affected: 6.4.0.15
Affected: 7.2.0
Affected: 7.0.2.1
Affected: 7.0.3
Affected: 6.6.7
Affected: 7.1.0.2
Affected: 7.2.0.1
Affected: 7.0.4
Affected: 7.2.1
Affected: 7.0.5
Affected: 6.4.0.16
Affected: 7.3.0
Affected: 7.2.2
Affected: 7.2.3
Affected: 6.6.7.1
Affected: 7.3.1
Affected: 7.1.0.3
Affected: 7.2.4
Affected: 7.0.6
Affected: 7.2.5
Affected: 7.2.4.1
Affected: 7.3.1.1
Affected: 7.4.0
Affected: 6.4.0.17
Affected: 7.0.6.1
Affected: 7.2.5.1
Affected: 7.4.1
Affected: 7.2.6
Affected: 7.0.6.2
Affected: 7.4.1.1
Affected: 6.6.7.2
Affected: 6.4.0.18
Affected: 7.2.7
Affected: 7.2.5.2
Affected: 7.3.1.2
Affected: 7.2.8
Affected: 7.6.0
Affected: 7.4.2
Affected: 7.2.8.1
Affected: 7.0.6.3
Affected: 7.4.2.1
Affected: 7.2.9
Affected: 7.0.7
Affected: 7.7.0
Affected: 7.4.2.2
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            {
              "status": "affected",
              "version": "9.8.4.17"
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            {
              "status": "affected",
              "version": "9.8.3.16"
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            {
              "status": "affected",
              "version": "9.8.4.20"
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            {
              "status": "affected",
              "version": "9.8.3.11"
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            {
              "status": "affected",
              "version": "9.12.1.3"
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            {
              "status": "affected",
              "version": "9.8.4.3"
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              "version": "9.12.4.4"
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              "version": "9.12.4.18"
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              "version": "9.8.4.35"
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              "version": "9.14.2.15"
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              "version": "9.12.4.30"
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            {
              "status": "affected",
              "version": "9.16.2.3"
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              "status": "affected",
              "version": "9.8.4.40"
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              "status": "affected",
              "version": "9.14.3.11"
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              "status": "affected",
              "version": "9.12.4.35"
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              "status": "affected",
              "version": "9.14.3.13"
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              "version": "9.16.2.7"
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              "version": "9.12.4.37"
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              "version": "9.14.4.6"
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              "status": "affected",
              "version": "9.16.3"
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            {
              "status": "affected",
              "version": "9.16.3.14"
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              "status": "affected",
              "version": "9.17.1.9"
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              "status": "affected",
              "version": "9.14.4.7"
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              "status": "affected",
              "version": "9.12.4.41"
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              "status": "affected",
              "version": "9.17.1.10"
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            {
              "status": "affected",
              "version": "9.8.4.44"
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              "version": "9.18.1"
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              "version": "9.12.4.47"
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              "version": "9.14.4.12"
            },
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              "version": "9.16.3.15"
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              "version": "9.18.1.3"
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              "status": "affected",
              "version": "9.17.1.11"
            },
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      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated, new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped, causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover.\r\n\r\nThis vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to create or delete files on the underlying operating system, which could cause the Remote Access SSL VPN service to become unresponsive.\r\nTo exploit this vulnerability, the attacker must be authenticated as a VPN user of the affected device."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-1287",
              "description": "Improper Validation of Specified Type of Input",
              "lang": "en",
              "type": "cwe"
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        }
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      "providerMetadata": {
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-asaftd-http-file-hUyX2jL4",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-http-file-hUyX2jL4"
        }
      ],
      "source": {
        "advisory": "cisco-sa-asaftd-http-file-hUyX2jL4",
        "defects": [
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        ],
        "discovery": "INTERNAL"
      },
      "title": "Cisco Secure Firewall Adaptive Security Appliance and Cisco Secure Firewall Threat Defense Software Authenticated Arbitrary File Deletion"
    }
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  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2025-20251",
    "datePublished": "2025-08-14T16:29:30.416Z",
    "dateReserved": "2024-10-10T19:15:13.240Z",
    "dateUpdated": "2025-08-14T19:19:38.255Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-http-file-hUyX2jL4\", \"name\": \"cisco-sa-asaftd-http-file-hUyX2jL4\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated, new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped, causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover.\\r\\n\\r\\nThis vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to create or delete files on the underlying operating system, which could cause the Remote Access SSL VPN service to become unresponsive.\\r\\nTo exploit this vulnerability, the attacker must be authenticated as a VPN user of the affected device.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-1287\", \"description\": \"Improper Validation of Specified Type of Input\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2025-08-14T16:29:30.416Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-20251\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-08-14T19:19:38.255Z\", \"dateReserved\": \"2024-10-10T19:15:13.240Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2025-08-14T16:29:30.416Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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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