CVE-2021-23840
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).
Key facts
- CVSS score
- 7.5 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
- CWE-190
- EPSS score
- 50.7% (99th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2021-1843)
- Published
- February 16, 2021
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2021-1843 in the EU Vulnerability Database. Last updated in EUVD on April 16, 2026.
View on the EU Vulnerability DatabaseAffected products
- debian / debian linux
- fujitsu / m10-1
- fujitsu / m10-1 firmware
- fujitsu / m10-4
- fujitsu / m10-4 firmware
- fujitsu / m10-4s
- fujitsu / m10-4s firmware
- fujitsu / m12-1
- fujitsu / m12-1 firmware
- fujitsu / m12-2
- fujitsu / m12-2 firmware
- fujitsu / m12-2s
- fujitsu / m12-2s firmware
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- mcafee / epolicy orchestrator
- nodejs / node.js
- nodejs / node.js
- nodejs / node.js
- openssl / openssl
- oracle / business intelligence
- oracle / business intelligence
- oracle / business intelligence
- oracle / business intelligence
- oracle / communications cloud native core policy
- oracle / enterprise manager for storage management
- oracle / enterprise manager ops center
- oracle / graalvm
- oracle / graalvm
- oracle / graalvm
- oracle / jd edwards enterpriseone tools
- oracle / jd edwards world security
- oracle / mysql server
- oracle / nosql database
- tenable / log correlation engine
- tenable / nessus network monitor
- tenable / nessus network monitor
- tenable / nessus network monitor
- tenable / nessus network monitor
- tenable / nessus network monitor
Certified products that may be affected
3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Nessus Network Monitor 5.12.0 - Tenable, Inc. - Common Criteria CCEVS-VR-VID-11068-2020 - archived
- McAfee Application Control v5.0, Change Control v5.0, and Integrity Monitor v5.0 with McAfee Agent v4.5 and ePolicy Orchestrator v4.5 - McAfee, Inc. - Common Criteria 383-4-153 - archived
- McAfee VirusScan Enterprise v8.5i and McAfee ePolicy Orchestrator v3.6 - McAfee, Inc. - Common Criteria CCEVS-VR-0047-2007 - archived
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf(Third Party Advisory)
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846(Third Party Advisory)
- https://kc.mcafee.com/corporate/index?page=content&id=SB10366(Third Party Advisory)
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://security.gentoo.org/glsa/202103-03(Third Party Advisory)
- https://security.netapp.com/advisory/ntap-20210219-0009/(Third Party Advisory)
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://www.debian.org/security/2021/dsa-4855(Third Party Advisory)
- https://www.openssl.org/news/secadv/20210216.txt(Vendor Advisory)
- https://www.oracle.com//security-alerts/cpujul2021.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuApr2021.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuapr2022.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpujan2022.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuoct2021.html(Patch, Third Party Advisory)
- https://www.tenable.com/security/tns-2021-03(Third Party Advisory)
- https://www.tenable.com/security/tns-2021-09(Third Party Advisory)
- https://www.tenable.com/security/tns-2021-10(Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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