CVE-2024-5642 (GCVE-0-2024-5642)

Vulnerability from cvelistv5 – Published: 2024-06-27 21:05 – Updated: 2026-07-31 14:06
VLAI
Title
Buffer overread when using an empty list with SSLContext.set_npn_protocols()
Summary
CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-28 13:47 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.9.24 (python)
Affected: 3.10.0a1 , < 3.10.0b1 (python)
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                  "attackVector": "NETWORK",
                  "availabilityImpact": "LOW",
                  "baseScore": 6.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "LOW",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-5642",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-06-28T13:47:34.169947Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "description": "CWE-noinfo Not enough information",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-06-28T13:47:40.782Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "CPython",
              "repo": "https://github.com/python/cpython",
              "vendor": "Python Software Foundation",
              "versions": [
                {
                  "lessThan": "3.9.24",
                  "status": "affected",
                  "version": "0",
                  "versionType": "python"
                },
                {
                  "lessThan": "3.10.0b1",
                  "status": "affected",
                  "version": "3.10.0a1",
                  "versionType": "python"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "CPython 3.9 and earlier doesn\u0027t disallow configuring an empty list (\"[]\") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see \u003cspan style=\"background-color: oklab(0.0852327 0.00000386313 0.00000170618 / 0.06);\"\u003eCVE\u003c/span\u003e\u003cspan style=\"background-color: oklab(0.0852327 0.00000386313 0.00000170618 / 0.06);\"\u003e-2024\u003c/span\u003e\u003cspan style=\"background-color: oklab(0.0852327 0.00000386313 0.00000170618 / 0.06);\"\u003e-5535\u003c/span\u003e for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).\u003cbr\u003e"
                }
              ],
              "value": "CPython 3.9 and earlier doesn\u0027t disallow configuring an empty list (\"[]\") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured)."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-31T14:06:47.138Z",
            "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
            "shortName": "PSF"
          },
          "references": [
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html"
            },
            {
              "tags": [
                "mitigation"
              ],
              "url": "https://github.com/python/cpython/pull/23014"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e"
            },
            {
              "url": "http://www.openwall.com/lists/oss-security/2024/06/28/4"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/python/cpython/issues/121227"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20240726-0005/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Buffer overread when using an empty list with SSLContext.set_npn_protocols()",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "assignerShortName": "PSF",
        "cveId": "CVE-2024-5642",
        "datePublished": "2024-06-27T21:05:31.281Z",
        "dateReserved": "2024-06-04T18:40:21.539Z",
        "dateUpdated": "2026-07-31T14:06:47.138Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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.