CVE-2019-1563 | Padding Oracle in PKCS7_dataDecode and CMS_decrypt_set1_pkey

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).

Published: 2019-09-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-1563 is rated Moderate Risk (46.4/100): CVSS Low severity, with medium exploitation likelihood (EPSS 3.84%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-1563

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 3.34% 3.84% +0.50%
2 2026-06-15 1.12% 3.34% +2.22%
3 2026-05-28 — 1.12% —

Full EPSS history (53 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1563

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 1.4 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-1563

OS Trackers for CVE-2019-1563

vendor priority summary link
alpine low CVE-2019-1563: 3 source package rows (openssl, openssl1.1-compat, openssl3); 25 state rows across 13 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-community, edge-main); fixed 15, open 10. https://security.alpinelinux.org/vuln/CVE-2019-1563
debian not yet assigned CVE-2019-1563 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-1563
gentoo low CVE-2019-1563: 1 GLSA(s) (201911-04), 1 atom(s) (dev-libs/openssl); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-1563
redhat low — https://access.redhat.com/security/cve/CVE-2019-1563
suse low CVE-2019-1563 severity low: SUSE including 485 source package names (0.1.0:libopenssl1_1-1.1.0i-14.3.1, 0.1.75:libopenssl1_1-1.1.0i-14.3.1, …), 954 product×package rows across 169 product lines (Container caasp/v4/389-ds, Container caasp/v4/busybox, … (169 product lines)): Fixed 671, Known Affected 157, Known Not Affected 126. https://www.suse.com/security/cve/CVE-2019-1563/
ubuntu low CVE-2019-1563 low priority: Ubuntu including 4 source packages (edk2, nodejs, openssl, openssl1.0), 72 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 28, released 18, DNE 17, ignored 3, needed 3, needs-triage 3. https://ubuntu.com/security/CVE-2019-1563

Affected software / configurations for CVE-2019-1563

Vendor Product Version Raw CPE
openssl openssl >= 1.0.2, <= 1.0.2s cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 1.1.0, <= 1.1.0k cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 1.1.1, <= 1.1.1c cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

References for CVE-2019-1563

URL Tags
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
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=08229ad838c50f644d7e928e2eef147b4308ad64
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=631f94db0065c78181ca9ba5546ebc8bb3884b97
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=e21f8cf78a125cd3c8c0d1a1a6c8bb0b901f893f
https://kc.mcafee.com/corporate/index?page=content&id=SB10365
https://lists.debian.org/debian-lts-announce/2019/09/msg00026.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GY6SNRJP2S7Y42GIIDO3HXPNMDYN2U3A/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZN4VVQJ3JDCHGIHV4Y2YTXBYQZ6PWQ7E/
https://seclists.org/bugtraq/2019/Oct/0
https://seclists.org/bugtraq/2019/Oct/1
https://seclists.org/bugtraq/2019/Sep/25
https://security.gentoo.org/glsa/201911-04
https://security.netapp.com/advisory/ntap-20190919-0002/
https://support.f5.com/csp/article/K97324400?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/4376-1/
https://usn.ubuntu.com/4376-2/
https://usn.ubuntu.com/4504-1/
https://www.debian.org/security/2019/dsa-4539
https://www.debian.org/security/2019/dsa-4540
https://www.openssl.org/news/secadv/20190910.txt Vendor Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
https://www.tenable.com/security/tns-2019-09
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