# CVE-2019-1563: libssl3t64: In situations where an attacker receives automated notification of thesuccess or failure of a decryption attempt an a...

CVE-2019-1563 is fixed in 8 products on 1 platform, first by libssl1.1 1.1.1-1ubuntu2.1~18.04.6, released December 6, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-1563
- Priority: Routine
- CVSS: 3.7 (Low)
- EPSS: 0.0384
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 10, 2019

## Description

In situations where an attacker receives automated notification of thesuccess or failure of a decryption attempt an attacker, after sending avery large number of messages to be decrypted, can recover a CMS/PKCS7transported encryption key or decrypt any RSA encrypted message that wasencrypted with the public RSA key, using a Bleichenbacher padding oracleattack. Applications are not affected if they use a certificate togetherwith the private RSA key to the CMS_decrypt or PKCS7_decrypt functions toselect 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.4 | [libssl1.0.0 1.0.2n-1ubuntu5.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.4.md) | Sep 8, 2020 |
| Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.6 | [libssl1.1 1.1.1-1ubuntu2.1~18.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.6.md) | Dec 6, 2019 |
| Linux | libssl3t64 Ubuntu 24.10 (oracular) | 1.1.1d-2ubuntu1 | [libssl3t64 1.1.1d-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libssl3t64-1.1.1d-2ubuntu1.md) | Jan 16, 2026 |
| Linux | libssl3t64 Ubuntu 25.04 (plucky) | 1.1.1d-2ubuntu1 | [libssl3t64 1.1.1d-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libssl3t64-1.1.1d-2ubuntu1.md) | Jan 16, 2026 |
| Linux | openssl RHEL 8 | 1:1.1.1c-15.el8 | [RHSA-2020:1840](https://patchblox.com/security/data/fix/linux/rhsa-2020-1840.md) | Apr 28, 2020 |
| Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.6 | [openssl 1.1.1-1ubuntu2.1~18.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.6.md) | Dec 6, 2019 |
| Linux | openssl Ubuntu 24.10 (oracular) | 1.1.1d-2ubuntu1 | [openssl 1.1.1d-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-openssl-1.1.1d-2ubuntu1.md) | Jan 16, 2026 |
| Linux | openssl Ubuntu 25.04 (plucky) | 1.1.1d-2ubuntu1 | [openssl 1.1.1d-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-openssl-1.1.1d-2ubuntu1.md) | Jan 16, 2026 |
| Linux | openssl ol 8 | 1:1.1.1c-15.el8 | [ELSA-2020-1840](https://patchblox.com/security/data/fix/linux/elsa-2020-1840.md) | May 5, 2020 |
| Linux | openssl-devel RHEL 8 | 1:1.1.1c-15.el8 | [RHSA-2020:1840](https://patchblox.com/security/data/fix/linux/rhsa-2020-1840.md) | Apr 28, 2020 |
| Linux | openssl-devel ol 8 | 1:1.1.1c-15.el8 | [ELSA-2020-1840](https://patchblox.com/security/data/fix/linux/elsa-2020-1840.md) | May 5, 2020 |
| Linux | openssl-libs RHEL 8 | 1:1.1.1c-15.el8 | [RHSA-2020:1840](https://patchblox.com/security/data/fix/linux/rhsa-2020-1840.md) | Apr 28, 2020 |
| Linux | openssl-libs ol 8 | 1:1.1.1c-15.el8 | [ELSA-2020-1840](https://patchblox.com/security/data/fix/linux/elsa-2020-1840.md) | May 5, 2020 |
| Linux | openssl-perl RHEL 8 | 1:1.1.1c-15.el8 | [RHSA-2020:1840](https://patchblox.com/security/data/fix/linux/rhsa-2020-1840.md) | Apr 28, 2020 |
| Linux | openssl-perl ol 8 | 1:1.1.1c-15.el8 | [ELSA-2020-1840](https://patchblox.com/security/data/fix/linux/elsa-2020-1840.md) | May 5, 2020 |
| Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.4 | [openssl1.0 1.0.2n-1ubuntu5.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.4.md) | Sep 8, 2020 |

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