CVE-2021-23840 vulnerability in OpenSSL and Other Products
Published on February 16, 2021
Integer overflow in CipherUpdate
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).
Products Associated with CVE-2021-23840
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Affected Versions
OpenSSL:- Version Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i) is affected.
- Version Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x) is affected.
Exploit Probability
EPSS
0.41%
Percentile
61.02%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.