CVE-2021-23840

high Tenable
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.6%
Exploitation probability in 30 days
Top 30% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: February 16, 2021 (1912 days ago)
Last Modified: April 16, 2026
Vendor: Tenable
Source: NVD

Description

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).

CWE

CWE-190

Affected Products

openssl openssldebian debian linuxtenable log correlation enginetenable nessus network monitororacle business intelligenceoracle communications cloud native core policyoracle enterprise manager for storage managementoracle enterprise manager ops centeroracle graalvmoracle jd edwards enterpriseone tools

References

🔗 cert-portal.siemens.com 🔗 git.openssl.org 🔗 git.openssl.org 🔗 kb.pulsesecure.net 🔗 kc.mcafee.com