CVE-2025-61984 (GCVE-0-2025-61984)

Vulnerability from cvelistv5 – Published: 2025-10-06 00:00 – Updated: 2025-11-11 14:50
VLAI?
Summary
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-159 - Improper Handling of Invalid Use of Special Elements
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-61984",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-07T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-08T03:55:09.867Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-11T14:50:56.007Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/10/07/1"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/10/12/1"
          },
          {
            "url": "https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh"
          },
          {
            "url": "https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh"
          }
        ],
        "title": "CVE Program Container",
        "x_generator": {
          "engine": "ADPogram 0.0.1"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSH",
          "vendor": "OpenBSD",
          "versions": [
            {
              "lessThan": "10.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 3.6,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-159",
              "description": "CWE-159 Improper Handling of Invalid Use of Special Elements",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-06T18:17:49.959Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.openwall.com/lists/oss-security/2025/10/06/1"
        },
        {
          "url": "https://marc.info/?l=openssh-unix-dev\u0026m=175974522032149\u0026w=2"
        },
        {
          "url": "https://www.openssh.com/releasenotes.html#10.1p1"
        }
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2025-61984",
    "datePublished": "2025-10-06T00:00:00.000Z",
    "dateReserved": "2025-10-06T00:00:00.000Z",
    "dateUpdated": "2025-11-11T14:50:56.007Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-61984\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2025-10-06T19:15:36.157\",\"lastModified\":\"2025-11-11T15:15:36.703\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":3.6,\"baseSeverity\":\"LOW\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.0,\"impactScore\":2.5}]},\"weaknesses\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-159\"}]}],\"references\":[{\"url\":\"https://marc.info/?l=openssh-unix-dev\u0026m=175974522032149\u0026w=2\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.openssh.com/releasenotes.html#10.1p1\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.openwall.com/lists/oss-security/2025/10/06/1\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2025/10/07/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2025/10/12/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2025/10/07/1\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2025/10/12/1\"}, {\"url\": \"https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh\"}, {\"url\": \"https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh\"}], \"x_generator\": {\"engine\": \"ADPogram 0.0.1\"}, \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-11T14:50:56.007Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-61984\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-07T13:38:50.155795Z\"}}}], \"references\": [{\"url\": \"https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-06T18:36:46.952Z\"}}], \"cna\": {\"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 3.6, \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N\"}}], \"affected\": [{\"vendor\": \"OpenBSD\", \"product\": \"OpenSSH\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"10.1\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.openwall.com/lists/oss-security/2025/10/06/1\"}, {\"url\": \"https://marc.info/?l=openssh-unix-dev\u0026m=175974522032149\u0026w=2\"}, {\"url\": \"https://www.openssh.com/releasenotes.html#10.1p1\"}], \"x_generator\": {\"engine\": \"enrichogram 0.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-159\", \"description\": \"CWE-159 Improper Handling of Invalid Use of Special Elements\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"10.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2025-10-06T18:17:49.959Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-61984\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-11T14:50:56.007Z\", \"dateReserved\": \"2025-10-06T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2025-10-06T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.