CVE-2023-27537

publishedCWE-415

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.

Technical severity5.9 mediumCVSS 3.1 · NVD: [email protected]

Published2023-03-30Source updated 2026-11-02

Collected2026-11-033 attributed sources

Fixes and workarounds

No remediation reported in collected sources.

Missing remediation information is not evidence that no patch exists.

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
https://github.com/curl/curl n/a	Fixed in 8.0.0 (affected)	CNA: hackerone
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.0; < V3.1.5 (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens	≥ V3.1.0; < V3.1.5 (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.0; < V3.1.5 (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (7)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:haxx:libcurl:7.88.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:haxx:libcurl:7.88.1:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:netapp:clustered_data_ontap:9.0:-:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "8.2.12",
            "versionStartIncluding": "8.2.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "9.0.6",
            "versionStartIncluding": "9.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 5.9 medium	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`	NVD: [email protected]

Exploit evidence

https://hackerone.com/reports/1897203
exploit · [email protected]
https://hackerone.com/reports/1897203
exploit · af854a3a-2127-422b-91ae-364da2661108

References

https://hackerone.com/reports/1897203CNA: hackerone
https://security.netapp.com/advisory/ntap-20230420-0010/CNA: hackerone
https://security.gentoo.org/glsa/202310-12CNA: hackerone · vendor-advisory
https://hackerone.com/reports/1897203ADP: CVE · x_transferred
https://security.netapp.com/advisory/ntap-20230420-0010/ADP: CVE · x_transferred
https://security.gentoo.org/glsa/202310-12ADP: CVE · vendor-advisory, x_transferred
https://cert-portal.siemens.com/productcert/html/ssa-398330.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-943925.htmlADP: siemens-SADP
https://hackerone.com/reports/1897203[email protected] · Exploit, Third Party Advisory
https://security.gentoo.org/glsa/202310-12[email protected] · Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0010/[email protected] · Third Party Advisory
https://hackerone.com/reports/1897203af854a3a-2127-422b-91ae-364da2661108 · Exploit, Third Party Advisory
https://security.gentoo.org/glsa/202310-12af854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0010/af854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-943925.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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