CVE-2021-23840 (GCVE-0-2021-23840)

Vulnerability from cvelistv5 – Published: 2021-02-16 16:55 – Updated: 2026-04-16 14:12
VLAI
Title
Integer overflow in CipherUpdate
Summary
Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • Overflow
  • CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i)
Affected: Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)
Create a notification for this product.
Date Public
2021-02-16 00:00
Credits
Paul Kehrer
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).\"}, {\"lang\": \"es\", \"value\": \"Las llamadas a EVP_CipherUpdate, EVP_EncryptUpdate y EVP_DecryptUpdate, pueden desbordar el argumento de la longitud de salida en algunos casos en los que la longitud de entrada est\\u00e1 cerca de la longitud m\\u00e1xima permitida para un entero en la plataforma. En tales casos, el valor de retorno de la llamada a la funci\\u00f3n ser\\u00e1 1 (indicando success), pero el valor de la longitud de salida ser\\u00e1 negativo. Esto podr\\u00eda causar que las aplicaciones se comporten de forma incorrecta o se bloqueen. Las versiones de OpenSSL 1.1.1i e inferiores est\\u00e1n afectadas por este problema. Los usuarios de estas versiones deber\\u00edan actualizar a OpenSSL versi\\u00f3n 1.1.1j. Las versiones de OpenSSL 1.0.2x e inferiores est\\u00e1n afectadas por este problema. Sin embargo, OpenSSL versi\\u00f3n 1.0.2 est\\u00e1 fuera de soporte y ya no recibe actualizaciones p\\u00fablicas. Los clientes con soporte Premium de OpenSSL versi\\u00f3n 1.0.2 deben actualizar a la versi\\u00f3n 1.0.2y. Los dem\\u00e1s usuarios deben actualizar a la versi\\u00f3n 1.1.1j. Corregido en OpenSSL versi\\u00f3n 1.1.1j (Afect\\u00f3 versiones 1.1.1-1.1.1i). Corregido en OpenSSL versi\\u00f3n 1.0.2y (Afect\\u00f3 versiones 1.0.2-1.0.2x)\"}]",
      "id": "CVE-2021-23840",
      "lastModified": "2024-11-21T05:51:55.210",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-02-16T17:15:13.300",
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      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Modified",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-23840\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2021-02-16T17:15:13.300\",\"lastModified\":\"2026-04-16T15:16:45.010\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).\"},{\"lang\":\"es\",\"value\":\"Las llamadas a EVP_CipherUpdate, EVP_EncryptUpdate y EVP_DecryptUpdate, pueden desbordar el argumento de la longitud de salida en algunos casos en los que la longitud de entrada est\u00e1 cerca de la longitud m\u00e1xima permitida para un entero en la plataforma. En tales casos, el valor de retorno de la llamada a la funci\u00f3n ser\u00e1 1 (indicando success), pero el valor de la longitud de salida ser\u00e1 negativo. Esto podr\u00eda causar que las aplicaciones se comporten de forma incorrecta o se bloqueen. Las versiones de OpenSSL 1.1.1i e inferiores est\u00e1n afectadas por este problema. Los usuarios de estas versiones deber\u00edan actualizar a OpenSSL versi\u00f3n 1.1.1j. Las versiones de OpenSSL 1.0.2x e inferiores est\u00e1n afectadas por este problema. Sin embargo, OpenSSL versi\u00f3n 1.0.2 est\u00e1 fuera de soporte y ya no recibe actualizaciones p\u00fablicas. Los clientes con soporte Premium de OpenSSL versi\u00f3n 1.0.2 deben actualizar a la versi\u00f3n 1.0.2y. Los dem\u00e1s usuarios deben actualizar a la versi\u00f3n 1.1.1j. Corregido en OpenSSL versi\u00f3n 1.1.1j (Afect\u00f3 versiones 1.1.1-1.1.1i). Corregido en OpenSSL versi\u00f3n 1.0.2y (Afect\u00f3 versiones 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      "cveMetadata": "{\"cveId\": \"CVE-2021-23840\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T14:12:36.721Z\", \"dateReserved\": \"2021-01-12T00:00:00.000Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2021-02-16T16:55:18.192Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
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.