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).

Scores

EPSS (exploitation in 30 days)

3.8% · top 9.8% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

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

Weakness

• Padding Oracle
• CWE-203 (opens in a new tab)All about CWE-203 and its CVEs
• CWE-327 (opens in a new tab)All about CWE-327 and its CVEs

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 (30)

• 20190912 [slackware-security] openssl (SSA:2019-254-03) (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• openSUSE-SU-2019:2158 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• FEDORA-2019-d15aac6c4e (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• openSUSE-SU-2019:2189 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• [debian-lts-announce] 20190925 [SECURITY] [DLA 1932-1] openssl security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• FEDORA-2019-d51641f152 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• 20191001 [SECURITY] [DSA 4539-1] openssl security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• 20191001 [SECURITY] [DSA 4540-1] openssl1.0 security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• DSA-4539 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• DSA-4540 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• openSUSE-SU-2019:2268 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• openSUSE-SU-2019:2269 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• GLSA-201911-04 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• USN-4376-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• https://www.oracle.com/security-alerts/cpuapr2020.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/security-alerts/cpujul2020.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/security-alerts/cpujan2020.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.openssl.org/news/secadv/20190910.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://packetstormsecurity.com/files/154467/Slackware-Security-Advisory-openssl-Updates.html (opens in a new tab)x_refsource_MISCx_transferred
• https://security.netapp.com/advisory/ntap-20190919-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.tenable.com/security/tns-2019-09 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=08229ad838c50f644d7e928e2eef147b4308ad64 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=631f94db0065c78181ca9ba5546ebc8bb3884b97 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=e21f8cf78a125cd3c8c0d1a1a6c8bb0b901f893f (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://support.f5.com/csp/article/K97324400?utm_source=f5support&amp%3Butm_medium=RSS (opens in a new tab)x_refsource_CONFIRMx_transferred
• USN-4376-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• USN-4504-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• https://www.oracle.com/security-alerts/cpuoct2020.html (opens in a new tab)x_refsource_MISCx_transferred
• https://kc.mcafee.com/corporate/index?page=content&id=SB10365 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

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

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-1563](https://trackcve.app/badge/CVE-2019-1563.svg)](https://trackcve.app/cve/CVE-2019-1563)

Record last updated 8 Oct 2026, 21:13 UTC.