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Vulnerability record · CVE-2019-1559 · published 27 February 2019

CVE-2019-1559: Openssl observable discrepancy vulnerability

OOpenssl · Openssl

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

5.9 CVSS 3.1 Medium EPSS 17% · top 3.0% CWE-203 · Observable discrepancy
5.9CVSS 3.1 base score, v2 4.3
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
82Affected product versions listed by NVD
72References
17 Jun 2026Last modified by NVD

Description

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

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

Affected products

82 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00019.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00047.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00049.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00080.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/107174 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2304 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2437 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2439 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2471 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3929 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3931 Third Party Advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e
https://kc.mcafee.com/corporate/index?page=content&id=SB10282 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6J
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5
https://security.gentoo.org/glsa/201903-10 Third Party Advisory
https://security.netapp.com/advisory/ntap-20190301-0001/ PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20190301-0002/ Broken LinkThird Party Advisory
https://security.netapp.com/advisory/ntap-20190423-0002/ Third Party Advisory
https://support.f5.com/csp/article/K18549143 Third Party Advisory
https://support.f5.com/csp/article/K18549143?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/3899-1/ Third Party Advisory
https://usn.ubuntu.com/4376-2/ Broken Link
https://www.debian.org/security/2019/dsa-4400 Third Party Advisory
https://www.openssl.org/news/secadv/20190226.txt Vendor Advisory
https://www.oracle.com/security-alerts/cpujan2020.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html PatchThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html PatchThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html PatchThird Party Advisory
https://www.tenable.com/security/tns-2019-02 PatchThird Party Advisory
https://www.tenable.com/security/tns-2019-03 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00019.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00047.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-1559), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.