CVE-2021-23840 (GCVE-0-2021-23840)
Vulnerability from cvelistv5 – Published: 2021-02-16 16:55 – Updated: 2026-04-16 14:12
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 14:12 UTC
CWE
- Overflow
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
20 references
Impacted products
Date Public
2021-02-16 00:00
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"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)."
},
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"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)"
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"id": "CVE-2021-23840",
"lastModified": "2024-11-21T05:51:55.210",
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"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)."
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"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)"
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"url": "https://www.tenable.com/security/tns-2021-10"
},
{
"url": "https://www.tenable.com/security/tns-2021-09"
},
{
"url": "https://security.netapp.com/advisory/ntap-20210219-0009/"
},
{
"url": "https://www.tenable.com/security/tns-2021-03"
},
{
"name": "[bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8",
"tags": [
"mailing-list"
],
"url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"
},
{
"name": "[bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8",
"tags": [
"mailing-list"
],
"url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"
},
{
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846"
},
{
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10366"
},
{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
},
{
"url": "https://security.netapp.com/advisory/ntap-20240621-0006/"
}
],
"title": "Integer overflow in CipherUpdate"
}
},
"cveMetadata": {
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"assignerShortName": "openssl",
"cveId": "CVE-2021-23840",
"datePublished": "2021-02-16T16:55:18.192Z",
"dateReserved": "2021-01-12T00:00:00.000Z",
"dateUpdated": "2026-04-16T14:12:36.721Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
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.
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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.