Vulnerability-Lookup

oesa-2025-2611

Vulnerability from osv_openeuler

Published

2025-10-31 11:09

Modified

2026-08-06 11:09

Summary

libwebsockets security update

Details

Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.

Security Fix(es):

Use After Free vulnerability exists in the WebSocket server implementation in lws_handshake_server in warmcat libwebsockets. In specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, an attacker may achieve denial of service.(CVE-2025-11677)

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.(CVE-2025-11678)

Severity

7.6 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-11677	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-11678	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.0-7.oe2203sp4.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2203sp4.aarch64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2203sp4.aarch64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.0-7.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.0-7.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.0-7.oe2203sp4.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2203sp4.x86_64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2203sp4.x86_64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.0-7.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-4.oe2403.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403.aarch64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403.aarch64.rpm",
          "libwebsockets-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp2.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-4.oe2403.noarch.rpm",
          "libwebsockets-help-4.3.3-4.oe2403sp1.noarch.rpm",
          "libwebsockets-help-4.3.3-4.oe2403sp2.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-4.oe2403.src.rpm",
          "libwebsockets-4.3.3-4.oe2403sp1.src.rpm",
          "libwebsockets-4.3.3-4.oe2403sp2.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-4.oe2403.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403.x86_64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403.x86_64.rpm",
          "libwebsockets-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-4.oe2403sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp1.aarch64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-4.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-4.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp1.x86_64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-4.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp2.aarch64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp2.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-4.oe2403sp2.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-4.oe2403sp2.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-4.oe2403sp2.x86_64.rpm",
          "libwebsockets-devel-4.3.3-4.oe2403sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP2",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-4.oe2403sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.0-7.oe2003sp4.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2003sp4.aarch64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2003sp4.aarch64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.0-7.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.0-7.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.0-7.oe2003sp4.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2003sp4.x86_64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2003sp4.x86_64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.0-7.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.0-7.oe2203sp3.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2203sp3.aarch64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2203sp3.aarch64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2203sp3.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.0-7.oe2203sp3.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.0-7.oe2203sp3.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.0-7.oe2203sp3.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.0-7.oe2203sp3.x86_64.rpm",
          "libwebsockets-debugsource-4.3.0-7.oe2203sp3.x86_64.rpm",
          "libwebsockets-devel-4.3.0-7.oe2203sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP3",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-22.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.0-7.oe2203sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nUse After Free vulnerability exists in the WebSocket server implementation in lws_handshake_server in warmcat libwebsockets. In specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, an attacker may achieve denial of service.(CVE-2025-11677)\n\nStack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.(CVE-2025-11678)",
  "id": "OESA-2025-2611",
  "modified": "2026-08-06T11:09:44Z",
  "published": "2025-10-31T11:09:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2611"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11677"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11678"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libwebsockets security update",
  "upstream": [
    "CVE-2025-11677",
    "CVE-2025-11678"
  ]
}

CVE-2025-11677 (GCVE-0-2025-11677)

Vulnerability from cvelistv5 – Published: 2025-10-20 13:41 – Updated: 2025-10-24 10:54

Title

Use After Free in libwebsockets WebSocket server

Summary

Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-20 13:53 UTC

CWE

CWE-416 - Use After Free

Assigner

Nozomi mitre root

References

2 references

URL	Tags
https://libwebsockets.org/git/libwebsockets/commi…	patchvendor-advisory
https://www.nozominetworks.com/labs/vulnerability…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
warmcat	libwebsockets	Affected: 3 , ≤ 4.4.1,4.3.6 (semver) cpe:2.3:a:warmcat:libwebsockets::::::::

Credits

Raffaele Bova at Nozomi Networks

Show details on NVD website

JSON

To clipboard

{
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              "content": {
                "id": "CVE-2025-11677",
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-20T13:53:56.413873Z",
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    "cna": {
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          "modules": [
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          "vendor": "warmcat",
          "versions": [
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              "lessThanOrEqual": "4.4.1,4.3.6",
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:a:warmcat:libwebsockets:*:*:*:*:*:*:*:*",
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      "impacts": [
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      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
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            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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          "url": "https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a"
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          "url": "https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677"
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      "solutions": [
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              "base64": false,
              "type": "text/html",
              "value": "Update the library to its latest stable release, if not possible backport the fix commit 2f082ec31261f556969160143ba94875d783971a"
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    "datePublished": "2025-10-20T13:41:10.787Z",
    "dateReserved": "2025-10-13T09:56:10.952Z",
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    "state": "PUBLISHED"
  },
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}

CVE-2025-11678 (GCVE-0-2025-11678)

Vulnerability from cvelistv5 – Published: 2025-10-20 13:51 – Updated: 2025-10-20 14:00

Title

Stack-based Buffer Overflow in libwebsockets DNS response parsing

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-20 14:00 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

Nozomi mitre root

References

2 references

URL	Tags
https://libwebsockets.org/git/libwebsockets/commi…	patchvendor-advisory
https://www.nozominetworks.com/labs/vulnerability…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
warmcat	libwebsocket	Affected: 4.0 , ≤ 4.4.2 (semver) Affected: 4.0 , ≤ 4.3.6 (semver)

Credits

Raffaele Bova at Nozomi Networks

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2025-10-20T14:00:37.720Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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          "collectionURL": "https://libwebsockets.org/git/libwebsockets",
          "defaultStatus": "unaffected",
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "valueDensity": "NOT_DEFINED",
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        "orgId": "bec8025f-a851-46e5-b3a3-058e6b0aa23c",
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          "url": "https://libwebsockets.org/git/libwebsockets/commit?id=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a"
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      "source": {
        "discovery": "EXTERNAL"
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      "title": "Stack-based Buffer Overflow in libwebsockets DNS response parsing",
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  "cveMetadata": {
    "assignerOrgId": "bec8025f-a851-46e5-b3a3-058e6b0aa23c",
    "assignerShortName": "Nozomi",
    "cveId": "CVE-2025-11678",
    "datePublished": "2025-10-20T13:51:17.328Z",
    "dateReserved": "2025-10-13T09:56:39.308Z",
    "dateUpdated": "2025-10-20T14:00:37.720Z",
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}

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.

Action not permitted

oesa-2025-2611

Vulnerability from osv_openeuler

CVE-2025-11677 (GCVE-0-2025-11677)

CVE-2025-11678 (GCVE-0-2025-11678)

Tags

Sightings

Nomenclature

Related by attack behaviour