Vulnerability-Lookup

OESA-2025-2090 (CVE-2025-53859)

Vulnerability from osv_openeuler – Published: 2025-08-29 11:09 – Updated: 2026-08-06 11:09 – Source website

Summary

nginx security update

Details

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method "none," and (3) the authentication server returns the "Auth-Wait" response header.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2025-53859)

Severity

3.7 (Low)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-53859	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "nginx-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-debuginfo-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-debugsource-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-devel-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-http-image-filter-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-http-perl-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-http-xslt-filter-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-mail-1.21.5-8.oe2003sp4.aarch64.rpm",
          "nginx-mod-stream-1.21.5-8.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "nginx-all-modules-1.21.5-8.oe2003sp4.noarch.rpm",
          "nginx-filesystem-1.21.5-8.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "nginx-1.21.5-8.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "nginx-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-debuginfo-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-debugsource-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-devel-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-http-image-filter-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-http-perl-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-http-xslt-filter-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-mail-1.21.5-8.oe2003sp4.x86_64.rpm",
          "nginx-mod-stream-1.21.5-8.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "nginx",
        "purl": "pkg:rpm/openEuler/nginx\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.21.5-8.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "NGINX is a free, open-source, high-performance HTTP server and reverse proxy,  as well as an IMAP/POP3 proxy server.\r\n\r\nSecurity Fix(es):\n\nNGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method \u0026quot;none,\u0026quot; and (3) the authentication server returns the \u0026quot;Auth-Wait\u0026quot; response header.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2025-53859)",
  "id": "OESA-2025-2090",
  "modified": "2026-08-06T11:09:10Z",
  "published": "2025-08-29T11:09:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2090"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53859"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nginx security update",
  "upstream": [
    "CVE-2025-53859"
  ]
}

CVE-2025-53859 (GCVE-0-2025-53859)

Vulnerability from cvelistv5 – Published: 2025-08-13 14:46 – Updated: 2025-11-04 21:12

Title

NGINX ngx_mail_smtp_module vulnerability

Summary

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-08-13 15:06 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

f5 mitre root

References

2 references

URL	Tags
https://my.f5.com/manage/s/article/K000152786	vendor-advisory
http://www.openwall.com/lists/oss-security/2025/08/13/5

Impacted products

2 products

Vendor	Product	Version
F5	NGINX Plus	Unaffected: R35 (custom) Affected: R34 , < R34 P2 (custom) Affected: R33 , < R33 P3 (custom) Affected: R32 , < R32 P3 (custom) Affected: R31 , < * (custom) Affected: R30 , < * (custom)
F5	NGINX Open Source	Affected: 0.7 , < 1.29.1 (custom)

Date Public

2025-08-13 14:00

Credits

F5 acknowledges the Amazon Web Services Security team for bringing this issue to our attention and following the highest standards of coordinated disclosure.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-53859",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-08-13T15:06:23.895538Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-08-13T15:14:55.021Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T21:12:39.856Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/08/13/5"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "ngx_mail_smtp_module"
          ],
          "product": "NGINX Plus",
          "vendor": "F5",
          "versions": [
            {
              "status": "unaffected",
              "version": "R35",
              "versionType": "custom"
            },
            {
              "lessThan": "R34 P2",
              "status": "affected",
              "version": "R34",
              "versionType": "custom"
            },
            {
              "lessThan": "R33 P3",
              "status": "affected",
              "version": "R33",
              "versionType": "custom"
            },
            {
              "lessThan": "R32 P3",
              "status": "affected",
              "version": "R32",
              "versionType": "custom"
            },
            {
              "lessThan": "*",
              "status": "affected",
              "version": "R31",
              "versionType": "custom"
            },
            {
              "lessThan": "*",
              "status": "affected",
              "version": "R30",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "modules": [
            "ngx_mail_smtp_module"
          ],
          "product": "NGINX Open Source",
          "vendor": "F5",
          "versions": [
            {
              "lessThan": "1.29.1",
              "status": "affected",
              "version": "0.7",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "F5 acknowledges the Amazon Web Services Security team for bringing this issue to our attention and following the highest standards of coordinated disclosure."
        }
      ],
      "datePublic": "2025-08-13T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method \"none,\" and (3) the authentication server returns the \"Auth-Wait\" response header.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
            }
          ],
          "value": "NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method \"none,\" and (3) the authentication server returns the \"Auth-Wait\" response header.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-13T14:46:55.471Z",
        "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "shortName": "f5"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://my.f5.com/manage/s/article/K000152786"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "NGINX ngx_mail_smtp_module vulnerability",
      "x_generator": {
        "engine": "F5 SIRTBot v1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
    "assignerShortName": "f5",
    "cveId": "CVE-2025-53859",
    "datePublished": "2025-08-13T14:46:55.471Z",
    "dateReserved": "2025-07-29T17:12:25.039Z",
    "dateUpdated": "2025-11-04T21:12:39.856Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.