CVE-2019-1563

In situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker, after sending a very large number of messages to be decrypted, can recover a CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message that was encrypted with the public RSA key, using a Bleichenbacher padding oracle attack. Applications are not affected if they use a certificate together with the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

CVSS 3.1

3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

3.8% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-25)

CWEs

CWE-203, CWE-327

Published

2019-09-10

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• openssl:openssl

References

• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00054.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00072.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00016.html
• http://packetstormsecurity.com/files/154467/Slackware-Security-Advisory-openssl-Updates.html

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