ssl/s3_clnt.c in OpenSSL 1.0.0 before 1.0.0t, 1.0.1 before 1.0.1p, and 1.0.2 before 1.0.2d, when used for a multi-threaded client, writes th
ssl/s3_clnt.c in OpenSSL 1.0.0 before 1.0.0t, 1.0.1 before 1.0.1p, and 1.0.2 before 1.0.2d, when used for a multi-threaded client, writes the PSK identity hint to an incorrect data structure, which allows remote servers to cause a denial of service (race condition and double free) via a crafted ServerKeyExchange message.
- Published
- Dec 6, 2015
- Updated
- Jun 16, 2026
- EPSS
- 12.8% · 96th percentile
- CWE
- CWE-362
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 12.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| hp | icewall sso | cpe:2.3:a:hp:icewall_sso |
| hp | icewall sso agent option | cpe:2.3:a:hp:icewall_sso_agent_option |
| oracle | vm virtualbox | cpe:2.3:a:oracle:vm_virtualbox |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server eus | cpe:2.3:o:redhat:enterprise_linux_server_eus |
| redhat | enterprise linux server tus | cpe:2.3:o:redhat:enterprise_linux_server_tus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
and 1 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux12.04
- canonical ubuntu linux14.04
- canonical ubuntu linux15.04
- canonical ubuntu linux15.10
- debian debian linux7.0
- debian debian linux8.0
- fedoraproject fedora22
- hp icewall sso10.0
- hp icewall sso agent option10.0
- openssl openssl1.0.0
- openssl openssl1.0.0a
- openssl openssl1.0.0b
- openssl openssl1.0.0c
- openssl openssl1.0.0d
- openssl openssl1.0.0e
- openssl openssl1.0.0f
- openssl openssl1.0.0g
- openssl openssl1.0.0h
- openssl openssl1.0.0i
- openssl openssl1.0.0j
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | openssl | before 1.0.2d-1 | 1.0.2d-1 |
| Debian:7 | openssl | before 1.0.1e-2+deb7u18 | 1.0.1e-2+deb7u18 |
| Debian:8 | openssl | before 1.0.1k-3+deb8u2 | 1.0.1k-3+deb8u2 |
| Red Hat:enterprise_linux:6::client | openssl | before 0:1.0.1e-42.el6_7.1 | 0:1.0.1e-42.el6_7.1 |
| Red Hat:enterprise_linux:6::client | openssl-debuginfo | before 0:1.0.1e-42.el6_7.1 | 0:1.0.1e-42.el6_7.1 |
| Red Hat:enterprise_linux:6::client | openssl-devel | before 0:1.0.1e-42.el6_7.1 | 0:1.0.1e-42.el6_7.1 |
| Red Hat:enterprise_linux:6::client | openssl-perl | before 0:1.0.1e-42.el6_7.1 | 0:1.0.1e-42.el6_7.1 |
| Red Hat:enterprise_linux:6::client | openssl-static | before 0:1.0.1e-42.el6_7.1 | 0:1.0.1e-42.el6_7.1 |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.1e-51.el7_2.1 | 1:1.0.1e-51.el7_2.1 |
| SUSE:Linux Enterprise Desktop 12 | openssl | before 1.0.1i-27.6.1 | 1.0.1i-27.6.1 |
| SUSE:Linux Enterprise Desktop 12 SP1 | openssl | before 1.0.1i-36.1 | 1.0.1i-36.1 |
| SUSE:Linux Enterprise Server 11-SECURITY | openssl1 | before 1.0.1g-0.35.1 | 1.0.1g-0.35.1 |
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 |
|---|---|---|
| debian:openssl | 1.0.2d-1 · Debian:12 | Package registry (OSV) |
| red hat:openssl | 0:1.0.1e-42.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 0:1.0.1e-42.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-devel | 0:1.0.1e-42.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.1e-51.el7_2.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 0:1.0.1e-42.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-static | 0:1.0.1e-42.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| suse:openssl | 1.0.1i-36.1 · SUSE:Linux Enterprise Desktop 12 SP1 | Package registry (OSV) |
| suse:openssl1 | 1.0.1g-0.35.1 · SUSE:Linux Enterprise Server 11-SECURITY | 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.
No credits in the CNA record.
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
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- M
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P
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
- fortiguard.com/advisory/openssl-advisory-december-2015
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
- lists.fedoraproject.org/pipermail/package-announce/2015-December/173801.html
- lists.opensuse.org/opensuse-updates/2015-12/msg00070.html
- lists.opensuse.org/opensuse-updates/2015-12/msg00071.html
- marc.info/?l=bugtraq&m=145382583417444&w=2
- openssl.org/news/secadv/20151203.txt
- rhn.redhat.com/errata/RHSA-2015-2617.html
- rhn.redhat.com/errata/RHSA-2016-2957.html
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl
- www.debian.org/security/2015/dsa-3413
- www.fortiguard.com/advisory/openssl-advisory-december-2015
- www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- www.securityfocus.com/bid/78622
- www.securitytracker.com/id/1034294
- www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583
Vendor advisories and official records. Exploit/PoC links are deliberately left out.