Constructed ASN.1 types with a recursive definition could exceed the stack
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).
- BDU:2018-01501
- DLA-1330-1
- DSA-4157-1
- DSA-4158-1
- openSUSE-SU-2024:11134-1
- openSUSE-SU-2024:11501-1
- RHSA-2018:3090
- RHSA-2018:3221
- RHSA-2019:0367
- RHSA-2019:1711
- SUSE-SU-2018:0902-1
- SUSE-SU-2018:0905-1
- SUSE-SU-2018:0906-1
- SUSE-SU-2018:0925-1
- SUSE-SU-2018:0975-1
- SUSE-SU-2018:2072-1
- SUSE-SU-2018:2158-1
- SUSE-SU-2018:2534-1
- SUSE-SU-2018:2683-1
- SUSE-SU-2020:0495-1
- Published
- Mar 27, 2018
- Updated
- Jun 16, 2026
- EPSS
- 18.6% · 97th percentile
- CWE
- CWE-674
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 18.6%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- debian debian linux7.0
- debian debian linux8.0
- debian debian linux9.0
- openssl openssl1.1.0 and later · up to 1.1.0g inclusive
- openssl openssl1.0.2b and later · up to 1.0.2n inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.
OpenSSL OpenSSL
- 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)affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.3 | openssl | from 1.0.2b · before 1.0.2o-r0 | 1.0.2o-r0 |
| Debian:12 | libtomcrypt | before 1.18.2-1 | 1.18.2-1 |
| Debian:12 | openssl | before 1.1.0h-1 | 1.1.0h-1 |
| Debian:7 | openssl | before 1.0.1t-1+deb7u4 | 1.0.1t-1+deb7u4 |
| Debian:8 | openssl | before 1.0.1t-1+deb8u8 | 1.0.1t-1+deb8u8 |
| Debian:9 | openssl | before 1.1.0f-3+deb9u2 | 1.1.0f-3+deb9u2 |
| Debian:9 | openssl1.0 | before 1.0.2l-2+deb9u3 | 1.0.2l-2+deb9u3 |
| openSUSE:Tumbleweed | ovmf | before 202105-3.4 | 202105-3.4 |
| openSUSE:Tumbleweed | virtualbox | before 6.1.26-3.2 | 6.1.26-3.2 |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::server | AAVMF | before 0:20180508-3.gitee3198e672e2.el7 | 0:20180508-3.gitee3198e672e2.el7 |
| Red Hat:enterprise_linux:7::server | OVMF | before 0:20180508-3.gitee3198e672e2.el7 | 0:20180508-3.gitee3198e672e2.el7 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24 | before 0:1-6.jbcs.el6 | 0:1-6.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apache-commons-daemon-jsvc | before 1:1.1.0-3.redhat_2.jbcs.el6 | 1:1.1.0-3.redhat_2.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apache-commons-daemon-jsvc-debuginfo | before 1:1.1.0-3.redhat_2.jbcs.el6 | 1:1.1.0-3.redhat_2.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr | before 0:1.6.3-31.jbcs.el6 | 0:1.6.3-31.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-debuginfo | before 0:1.6.3-31.jbcs.el6 | 0:1.6.3-31.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-devel | before 0:1.6.3-31.jbcs.el6 | 0:1.6.3-31.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util | before 0:1.6.1-24.jbcs.el6 | 0:1.6.1-24.jbcs.el6 |
+96
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
- CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV90Now
- CVE-2021-3711SM2 Decryption Buffer Overflow65This week
- CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code 65This week
- CVE-2016-2108The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a denia62This week
- CVE-2016-6309statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a den60This week
- CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow58Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:openssl | 1.0.2o-r0 · Alpine:v3.3 | Package registry (OSV) |
| debian:libtomcrypt | 1.18.2-1 · Debian:12 | Package registry (OSV) |
| debian:openssl | 1.1.0h-1 · Debian:12 | Package registry (OSV) |
| debian:openssl1.0 | 1.0.2l-2+deb9u3 · Debian:9 | Package registry (OSV) |
| opensuse:ovmf | 202105-3.4 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:virtualbox | 6.1.26-3.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:AAVMF | 0:20180508-3.gitee3198e672e2.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:jbcs-httpd24 | 0:1-6.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apache-commons-daemon-jsvc | 1:1.1.0-3.redhat_2.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apache-commons-daemon-jsvc-debuginfo | 1:1.1.0-3.redhat_2.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:openssl | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-devel | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-static | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:ovmf | 0:20180508-3.gitee3198e672e2.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:OVMF | 0:20180508-3.gitee3198e672e2.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| suse:compat-openssl097g | 0.9.7g-146.22.51.5.1 · SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | Package registry (OSV) |
| suse:compat-openssl098 | 0.9.8j-106.6.1 · SUSE:Linux Enterprise Desktop 12 SP3 | Package registry (OSV) |
| suse:openssl | 1.0.1i-54.11.1 · SUSE:OpenStack Cloud 6 | Package registry (OSV) |
| suse:openssl1 | 1.0.1g-0.58.9.1 · SUSE:Linux Enterprise Server 11-SECURITY | Package registry (OSV) |
| suse:ovmf | 2017+git1510945757.b2662641d5-5.3.6 · SUSE:Linux Enterprise Module for Server Applications 15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-674 · Uncontrolled RecursionCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2018:3505
- access.redhat.com/errata/RHSA-2019:0366
- access.redhat.com/errata/RHSA-2019:0367
- access.redhat.com/errata/RHSA-2019:1711
- access.redhat.com/errata/RHSA-2019:1712
- access.redhat.com/errata/RHSA-2018:3090
- access.redhat.com/errata/RHSA-2018:3221
- www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- www.securityfocus.com/bid/103518
- www.securityfocus.com/bid/105609
- www.securitytracker.com/id/1040576
- git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2ac4c6f7b2b2af20c0e2b0ba05367e454cd11b33
- git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9310d45087ae546e27e61ddf8f6367f29848220d
- lists.debian.org/debian-lts-announce/2018/03/msg00033.html
- nodejs.org/en/blog/vulnerability/march-2018-security-releases/
- security.gentoo.org/glsa/201811-21
- security.gentoo.org/glsa/202007-53
- security.netapp.com/advisory/ntap-20180330-0002/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.