{"id":"CVE-2018-0739","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-0739","generatedAt":"2026-10-29T02:44:08.992Z","title":"Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion.","description":"Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).","published":"2018-03-27T21:29:01.000Z","lastModified":"2026-06-17T01:31:34.000Z","status":"Modified","sourceIdentifier":"openssl-security@openssl.org","cvss":{"version":"3.0","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"cwe":["CWE-674"],"affected":["openssl/openssl","canonical/ubuntu linux","debian/debian linux"],"epss":{"score":0.18596,"percentile":0.97241,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.21589,"percentile":0.97565},{"date":"2026-09-22","score":0.18596,"percentile":0.97129}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 18.6%, higher than 97% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html","tags":["Patch","Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html","source":"openssl-security@openssl.org"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","source":"openssl-security@openssl.org"},{"url":"http://www.securityfocus.com/bid/103518","tags":["Third Party Advisory","VDB Entry"],"source":"openssl-security@openssl.org"},{"url":"http://www.securityfocus.com/bid/105609","source":"openssl-security@openssl.org"},{"url":"http://www.securitytracker.com/id/1040576","tags":["Third Party Advisory","VDB Entry"],"source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:3090","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:3221","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:3505","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:0366","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:0367","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:1711","source":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:1712","source":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2ac4c6f7b2b2af20c0e2b0ba05367e454cd11b33","source":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9310d45087ae546e27e61ddf8f6367f29848220d","source":"openssl-security@openssl.org"},{"url":"https://lists.debian.org/debian-lts-announce/2018/03/msg00033.html","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://nodejs.org/en/blog/vulnerability/march-2018-security-releases/","source":"openssl-security@openssl.org"},{"url":"https://security.gentoo.org/glsa/201811-21","source":"openssl-security@openssl.org"},{"url":"https://security.gentoo.org/glsa/202007-53","source":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20180330-0002/","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20180726-0002/","source":"openssl-security@openssl.org"},{"url":"https://securityadvisories.paloaltonetworks.com/Home/Detail/133","source":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3611-1/","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3611-2/","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2018/dsa-4157","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2018/dsa-4158","tags":["Third Party Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://www.openssl.org/news/secadv/20180327.txt","tags":["Vendor Advisory"],"source":"openssl-security@openssl.org"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","source":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html","source":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","source":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html","source":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-04","source":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-06","source":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-07","source":"openssl-security@openssl.org"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/103518","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/105609","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1040576","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:3090","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:3221","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:3505","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:0366","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:0367","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1711","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1712","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2ac4c6f7b2b2af20c0e2b0ba05367e454cd11b33","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9310d45087ae546e27e61ddf8f6367f29848220d","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/03/msg00033.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://nodejs.org/en/blog/vulnerability/march-2018-security-releases/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201811-21","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202007-53","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20180330-0002/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20180726-0002/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://securityadvisories.paloaltonetworks.com/Home/Detail/133","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3611-1/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3611-2/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2018/dsa-4157","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2018/dsa-4158","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-0739","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}