CVE-2015-1789

The X509_cmp_time function in crypto/x509/x509_vfy.c in OpenSSL before 0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted length field in ASN1_TIME data, as demonstrated by an attack against a server that supports client authentication with a custom verification callback.

Published: 2015-06-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-1789 is rated High Risk (69.8/100): CVSS High severity, with high exploitation likelihood (EPSS 74.48%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +69.95% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2015-1789

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 2026-06-15 4.53% 74.48% +69.95%
2 2026-04-27 3.39% 4.53% +1.14%
3 2026-03-04 — 3.39% —

Full EPSS history (48 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-1789

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P 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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2015-1789

OS Trackers for CVE-2015-1789

vendor priority summary link
debian not yet assigned CVE-2015-1789 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-2015-1789
gentoo normal CVE-2015-1789: 1 GLSA(s) (201506-02), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-1789
redhat medium — https://access.redhat.com/security/cve/CVE-2015-1789
suse high — https://www.suse.com/security/cve/CVE-2015-1789/
ubuntu medium CVE-2015-1789 medium priority: Ubuntu including 2 source packages (openssl, openssl098), 26 status rows across 13 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 12, DNE 9, ignored 3, needs-triage 2. https://ubuntu.com/security/CVE-2015-1789

Affected software / configurations for CVE-2015-1789

Vendor Product Version Raw CPE
openssl openssl <= 0.9.8zf cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:*:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:beta1:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:beta2:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:beta3:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:beta4:*:*:*:*:*:*
openssl openssl 1.0.0 cpe:2.3:a:openssl:openssl:1.0.0:beta5:*:*:*:*:*:*
openssl openssl 1.0.0a cpe:2.3:a:openssl:openssl:1.0.0a:*:*:*:*:*:*:*
openssl openssl 1.0.0b cpe:2.3:a:openssl:openssl:1.0.0b:*:*:*:*:*:*:*
openssl openssl 1.0.0c cpe:2.3:a:openssl:openssl:1.0.0c:*:*:*:*:*:*:*
openssl openssl 1.0.0d cpe:2.3:a:openssl:openssl:1.0.0d:*:*:*:*:*:*:*
openssl openssl 1.0.0e cpe:2.3:a:openssl:openssl:1.0.0e:*:*:*:*:*:*:*
openssl openssl 1.0.0f cpe:2.3:a:openssl:openssl:1.0.0f:*:*:*:*:*:*:*
openssl openssl 1.0.0g cpe:2.3:a:openssl:openssl:1.0.0g:*:*:*:*:*:*:*
openssl openssl 1.0.0h cpe:2.3:a:openssl:openssl:1.0.0h:*:*:*:*:*:*:*
openssl openssl 1.0.0i cpe:2.3:a:openssl:openssl:1.0.0i:*:*:*:*:*:*:*
openssl openssl 1.0.0j cpe:2.3:a:openssl:openssl:1.0.0j:*:*:*:*:*:*:*
openssl openssl 1.0.0k cpe:2.3:a:openssl:openssl:1.0.0k:*:*:*:*:*:*:*
openssl openssl 1.0.0l cpe:2.3:a:openssl:openssl:1.0.0l:*:*:*:*:*:*:*
openssl openssl 1.0.0m cpe:2.3:a:openssl:openssl:1.0.0m:*:*:*:*:*:*:*
openssl openssl 1.0.0n cpe:2.3:a:openssl:openssl:1.0.0n:*:*:*:*:*:*:*
openssl openssl 1.0.0o cpe:2.3:a:openssl:openssl:1.0.0o:*:*:*:*:*:*:*
openssl openssl 1.0.0p cpe:2.3:a:openssl:openssl:1.0.0p:*:*:*:*:*:*:*
openssl openssl 1.0.0q cpe:2.3:a:openssl:openssl:1.0.0q:*:*:*:*:*:*:*
openssl openssl 1.0.0r cpe:2.3:a:openssl:openssl:1.0.0r:*:*:*:*:*:*:*
openssl openssl 1.0.1 cpe:2.3:a:openssl:openssl:1.0.1:*:*:*:*:*:*:*
openssl openssl 1.0.1 cpe:2.3:a:openssl:openssl:1.0.1:beta1:*:*:*:*:*:*
openssl openssl 1.0.1 cpe:2.3:a:openssl:openssl:1.0.1:beta2:*:*:*:*:*:*
openssl openssl 1.0.1 cpe:2.3:a:openssl:openssl:1.0.1:beta3:*:*:*:*:*:*
openssl openssl 1.0.1a cpe:2.3:a:openssl:openssl:1.0.1a:*:*:*:*:*:*:*
openssl openssl 1.0.1b cpe:2.3:a:openssl:openssl:1.0.1b:*:*:*:*:*:*:*
openssl openssl 1.0.1c cpe:2.3:a:openssl:openssl:1.0.1c:*:*:*:*:*:*:*
openssl openssl 1.0.1d cpe:2.3:a:openssl:openssl:1.0.1d:*:*:*:*:*:*:*
openssl openssl 1.0.1e cpe:2.3:a:openssl:openssl:1.0.1e:*:*:*:*:*:*:*
openssl openssl 1.0.1f cpe:2.3:a:openssl:openssl:1.0.1f:*:*:*:*:*:*:*
openssl openssl 1.0.1g cpe:2.3:a:openssl:openssl:1.0.1g:*:*:*:*:*:*:*
openssl openssl 1.0.1h cpe:2.3:a:openssl:openssl:1.0.1h:*:*:*:*:*:*:*
openssl openssl 1.0.1i cpe:2.3:a:openssl:openssl:1.0.1i:*:*:*:*:*:*:*
openssl openssl 1.0.1j cpe:2.3:a:openssl:openssl:1.0.1j:*:*:*:*:*:*:*
openssl openssl 1.0.1k cpe:2.3:a:openssl:openssl:1.0.1k:*:*:*:*:*:*:*
openssl openssl 1.0.1l cpe:2.3:a:openssl:openssl:1.0.1l:*:*:*:*:*:*:*
openssl openssl 1.0.1m cpe:2.3:a:openssl:openssl:1.0.1m:*:*:*:*:*:*:*
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:*:*:*:*:*:*:*
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:beta1:*:*:*:*:*:*
openssl openssl 1.0.2a cpe:2.3:a:openssl:openssl:1.0.2a:*:*:*:*:*:*:*
oracle sparc-opl_service_processor <= 1121 cpe:2.3:a:oracle:sparc-opl_service_processor:*:*:*:*:*:*:*:*

References for CVE-2015-1789

URL Tags
http://fortiguard.com/advisory/openssl-vulnerabilities-june-2015
http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10733
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160436.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160647.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00024.html
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00037.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
http://marc.info/?l=bugtraq&m=143654156615516&w=2
http://marc.info/?l=bugtraq&m=143880121627664&w=2
http://marc.info/?l=bugtraq&m=144050155601375&w=2
http://rhn.redhat.com/errata/RHSA-2015-1115.html
http://rhn.redhat.com/errata/RHSA-2015-1197.html
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150612-openssl
http://www.debian.org/security/2015/dsa-3287
http://www.fortiguard.com/advisory/2015-06-11-fortinet-vulnerability-openssl-vulnerabilities-june-2015
http://www.fortiguard.com/advisory/openssl-vulnerabilities-june-2015
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
http://www.securityfocus.com/bid/75156
http://www.securityfocus.com/bid/91787
http://www.securitytracker.com/id/1032564
http://www.ubuntu.com/usn/USN-2639-1
https://bto.bluecoat.com/security-advisory/sa98
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://github.com/openssl/openssl/commit/f48b83b4fb7d6689584cf25f61ca63a4891f5b11
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05131044
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150888
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05158380
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05353965
https://kc.mcafee.com/corporate/index?page=content&id=SB10122
https://openssl.org/news/secadv/20150611.txt
https://security.gentoo.org/glsa/201506-02
https://support.apple.com/kb/HT205031
https://support.citrix.com/article/CTX216642
https://www.arista.com/en/support/advisories-notices/security-advisories/1144-security-advisory-11
https://www.openssl.org/news/secadv_20150611.txt Vendor Advisory
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