CVE-2024-2511 (GCVE-0-2024-2511)

Vulnerability from cvelistv5 – Published: 2024-04-08 13:51 – Updated: 2026-05-12 11:30
VLAI?
Title
Unbounded memory growth with session handling in TLSv1.3
Summary
Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.
Severity ?
No CVSS data available.
CWE
  • CWE-1325 - Improperly Controlled Sequential Memory Allocation
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.2.0 , < 3.2.2 (semver)
Affected: 3.1.0 , < 3.1.6 (semver)
Affected: 3.0.0 , < 3.0.14 (semver)
Affected: 1.1.1 , < 1.1.1y (custom)
Create a notification for this product.
Date Public ?
2024-04-08 00:00
Credits
Manish Patidar (Hewlett Packard Enterprise) Matt Caswell
Show details on NVD website
To clipboard 

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      "cve": "CVE-2024-2511",
      "date": "2026-05-20",
      "epss": "0.08833",
      "percentile": "0.92627"
    },
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Issue summary: Some non-default TLS server configurations can cause unbounded\\nmemory growth when processing TLSv1.3 sessions\\n\\nImpact summary: An attacker may exploit certain server configurations to trigger\\nunbounded memory growth that would lead to a Denial of Service\\n\\nThis problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is\\nbeing used (but not if early_data support is also configured and the default\\nanti-replay protection is in use). In this case, under certain conditions, the\\nsession cache can get into an incorrect state and it will fail to flush properly\\nas it fills. The session cache will continue to grow in an unbounded manner. A\\nmalicious client could deliberately create the scenario for this failure to\\nforce a Denial of Service. It may also happen by accident in normal operation.\\n\\nThis issue only affects TLS servers supporting TLSv1.3. It does not affect TLS\\nclients.\\n\\nThe FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL\\n1.0.2 is also not affected by this issue.\"}, {\"lang\": \"es\", \"value\": \"Resumen del problema: algunas configuraciones de servidor TLS no predeterminadas pueden causar un crecimiento ilimitado de la memoria al procesar sesiones TLSv1.3. Resumen de impacto: un atacante puede explotar ciertas configuraciones del servidor para desencadenar un crecimiento ilimitado de la memoria que conducir\\u00eda a una denegaci\\u00f3n de servicio. Este problema puede ocurrir en TLSv1.3 si se utiliza la opci\\u00f3n SSL_OP_NO_TICKET no predeterminada (pero no si tambi\\u00e9n se configura la compatibilidad con early_data y se utiliza la protecci\\u00f3n antirrepetici\\u00f3n predeterminada). En este caso, bajo ciertas condiciones, el cach\\u00e9 de la sesi\\u00f3n puede entrar en un estado incorrecto y no se vaciar\\u00e1 correctamente a medida que se llena. La cach\\u00e9 de la sesi\\u00f3n seguir\\u00e1 creciendo de forma ilimitada. Un cliente malintencionado podr\\u00eda crear deliberadamente el escenario para que este fallo fuerce una denegaci\\u00f3n de servicio. Tambi\\u00e9n puede ocurrir por accidente durante el funcionamiento normal. Este problema solo afecta a los servidores TLS que admiten TLSv1.3. No afecta a los clientes TLS. Los m\\u00f3dulos FIPS en 3.2, 3.1 y 3.0 no se ven afectados por este problema. OpenSSL 1.0.2 tampoco se ve afectado por este problema.\"}]",
      "id": "CVE-2024-2511",
      "lastModified": "2024-11-21T09:09:54.753",
      "published": "2024-04-08T14:15:07.660",
      "references": "[{\"url\": \"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://www.openssl.org/news/secadv/20240408.txt\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2024/04/08/5\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240503-0013/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.openssl.org/news/secadv/20240408.txt\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Awaiting Analysis",
      "weaknesses": "[{\"source\": \"openssl-security@openssl.org\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-1325\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-2511\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2024-04-08T14:15:07.660\",\"lastModified\":\"2026-05-12T12:16:33.960\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Issue summary: Some non-default TLS server configurations can cause unbounded\\nmemory growth when processing TLSv1.3 sessions\\n\\nImpact summary: An attacker may exploit certain server configurations to trigger\\nunbounded memory growth that would lead to a Denial of Service\\n\\nThis problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is\\nbeing used (but not if early_data support is also configured and the default\\nanti-replay protection is in use). In this case, under certain conditions, the\\nsession cache can get into an incorrect state and it will fail to flush properly\\nas it fills. The session cache will continue to grow in an unbounded manner. A\\nmalicious client could deliberately create the scenario for this failure to\\nforce a Denial of Service. It may also happen by accident in normal operation.\\n\\nThis issue only affects TLS servers supporting TLSv1.3. It does not affect TLS\\nclients.\\n\\nThe FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL\\n1.0.2 is also not affected by this issue.\"},{\"lang\":\"es\",\"value\":\"Resumen del problema: algunas configuraciones de servidor TLS no predeterminadas pueden causar un crecimiento ilimitado de la memoria al procesar sesiones TLSv1.3. Resumen de impacto: un atacante puede explotar ciertas configuraciones del servidor para desencadenar un crecimiento ilimitado de la memoria que conducir\u00eda a una denegaci\u00f3n de servicio. Este problema puede ocurrir en TLSv1.3 si se utiliza la opci\u00f3n SSL_OP_NO_TICKET no predeterminada (pero no si tambi\u00e9n se configura la compatibilidad con early_data y se utiliza la protecci\u00f3n antirrepetici\u00f3n predeterminada). En este caso, bajo ciertas condiciones, el cach\u00e9 de la sesi\u00f3n puede entrar en un estado incorrecto y no se vaciar\u00e1 correctamente a medida que se llena. La cach\u00e9 de la sesi\u00f3n seguir\u00e1 creciendo de forma ilimitada. Un cliente malintencionado podr\u00eda crear deliberadamente el escenario para que este fallo fuerce una denegaci\u00f3n de servicio. Tambi\u00e9n puede ocurrir por accidente durante el funcionamiento normal. Este problema solo afecta a los servidores TLS que admiten TLSv1.3. No afecta a los clientes TLS. Los m\u00f3dulos FIPS en 3.2, 3.1 y 3.0 no se ven afectados por este problema. OpenSSL 1.0.2 tampoco se ve afectado por este problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"openssl-security@openssl.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1325\"}]}],\"references\":[{\"url\":\"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\",\"source\":\"openssl-security@openssl.org\"},{\"url\":\"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\",\"source\":\"openssl-security@openssl.org\"},{\"url\":\"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\",\"source\":\"openssl-security@openssl.org\"},{\"url\":\"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\",\"source\":\"openssl-security@openssl.org\"},{\"url\":\"https://www.openssl.org/news/secadv/20240408.txt\",\"source\":\"openssl-security@openssl.org\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/04/08/5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.netapp.com/advisory/ntap-20240503-0013/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.openssl.org/news/secadv/20240408.txt\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-354112.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-398330.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-613116.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-769027.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-915275.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20240408.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\", \"name\": \"3.2.2 git commit\", \"tags\": [\"patch\", \"x_transferred\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\", \"name\": \"3.1.6 git commit\", \"tags\": [\"patch\", \"x_transferred\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\", \"name\": \"3.0.14 git commit\", \"tags\": [\"patch\", \"x_transferred\"]}, {\"url\": \"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\", \"name\": \"1.1.1y git commit\", \"tags\": [\"patch\", \"x_transferred\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2024/04/08/5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240503-0013/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T21:54:02.419Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-2511\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-04-09T15:14:41.481807Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:22.616Z\"}}], \"cna\": {\"title\": \"Unbounded memory growth with session handling in TLSv1.3\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"Manish Patidar (Hewlett Packard Enterprise)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"Matt Caswell\"}], \"metrics\": [{\"other\": {\"type\": \"https://www.openssl.org/policies/secpolicy.html\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.2.0\", \"lessThan\": \"3.2.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.1.0\", \"lessThan\": \"3.1.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.0.0\", \"lessThan\": \"3.0.14\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.1.1\", \"lessThan\": \"1.1.1y\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2024-04-08T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20240408.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08\", \"name\": \"3.2.2 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce\", \"name\": \"3.1.6 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d\", \"name\": \"3.0.14 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640\", \"name\": \"1.1.1y git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: Some non-default TLS server configurations can cause unbounded\\nmemory growth when processing TLSv1.3 sessions\\n\\nImpact summary: An attacker may exploit certain server configurations to trigger\\nunbounded memory growth that would lead to a Denial of Service\\n\\nThis problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is\\nbeing used (but not if early_data support is also configured and the default\\nanti-replay protection is in use). 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OpenSSL\\n1.0.2 is also not affected by this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Some non-default TLS server configurations can cause unbounded\u003cbr\u003ememory growth when processing TLSv1.3 sessions\u003cbr\u003e\u003cbr\u003eImpact summary: An attacker may exploit certain server configurations to trigger\u003cbr\u003eunbounded memory growth that would lead to a Denial of Service\u003cbr\u003e\u003cbr\u003eThis problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is\u003cbr\u003ebeing used (but not if early_data support is also configured and the default\u003cbr\u003eanti-replay protection is in use). In this case, under certain conditions, the\u003cbr\u003esession cache can get into an incorrect state and it will fail to flush properly\u003cbr\u003eas it fills. The session cache will continue to grow in an unbounded manner. 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      "cveMetadata": "{\"cveId\": \"CVE-2024-2511\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T21:54:02.419Z\", \"dateReserved\": \"2024-03-15T15:33:52.037Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2024-04-08T13:51:12.349Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




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

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.