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CVE-2019-1563

Padding Oracle in PKCS7_dataDecode and CMS_decrypt_set1_pkey

Description

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).

Timeline

  1. ID reserved

    By openssl

  2. · 10 months later

    Published

  3. · 7 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2019-1563, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Low3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
3.8% · top 9.7% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.7.

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c)
    • affected Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k)
    • affected Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s)

References

References30

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .