CVE-2015-1793
MediumPublic exploitThe X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification…
Published Jul 9, 2015 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2015-1793, UBUNTU-CVE-2015-1793
Key Facts
Patch immediately- CVE-2015-1793 is a medium-severity vulnerability (CVSS 6.5 v3) affecting Openssl, Jd Edwards Enterpriseone Tools (Oracle), Supply Chain Products Suite (Oracle) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 58% probability of exploitation in the next 30 days.
- Fixed versions are available, including libmysql55client_r18 5.5.46-0.14.1, libmysql55client_r18-32bit 5.5.46-0.14.1, libmysql55client_r18-x86 5.5.46-0.14.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3
6.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
58%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2015-1793 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.
Affected Products
128 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OpensslOpenssl | 1.0.1n, 1.0.1o, 1.0.2b, 1.0.2c | 1.0.2d-1 |
| Jd Edwards Enterpriseone ToolsOracle | 9.1, 9.2 | n/a |
| Supply Chain Products SuiteOracle | 6.1.2.2, 6.1.3.0, 6.2.0 | n/a |
| Opus 10g Ethernet Switch FamilyOracle | See advisory | 2.0.0.6 |
| rootio-opensslrootio | See advisory | 1.0.2d-1 |
Patched Releases
libmysql55client_r18
5.5.46-0.14.1
libmysql55client_r18-32bit
5.5.46-0.14.1
libmysql55client_r18-x86
5.5.46-0.14.1
libmysql55client18
5.5.46-0.14.1
libmysql55client18-32bit
5.5.46-0.14.1
libmysql55client18-x86
5.5.46-0.14.1
libmysql56client_r18
5.6.27-8.1, 5.6.34-1.1
libmysql56client_r18-32bit
5.6.27-8.1, 5.6.34-1.1
libmysql56client18
5.6.27-8.1, 5.6.34-1.1
libmysql56client18-32bit
5.6.27-8.1, 5.6.34-1.1
libopenssl-1_1-devel
1.1.1l-1.2
libopenssl-1_1-devel-32bit
1.1.1l-1.2
libopenssl-devel
1.0.2j-2.2
libopenssl-devel-32bit
1.0.2j-2.2
libopenssl1_0_0
1.0.2j-2.2
libopenssl1_0_0-32bit
1.0.2j-2.2
libopenssl1_0_0-hmac
1.0.2j-2.2
libopenssl1_0_0-hmac-32bit
1.0.2j-2.2
libopenssl1_0_0-steam
1.0.2h-4.1
libopenssl1_0_0-steam-32bit
1.0.2h-4.1
libopenssl1_1
1.1.1l-1.2
libopenssl1_1-32bit
1.1.1l-1.2
libopenssl1_1-hmac
1.1.1l-1.2
mysql
5.5.46-0.14.1
mysql-client
5.5.46-0.14.1
Timeline
Publicly disclosed
Jul 9, 2015
Last updated
Aug 4, 2026
Weakness Type
- CWE-254
References
- advisoryhttp://openssl.org/news/secadv_20150709.txt
- advisoryhttps://bugzilla.suse.com/951391
- advisoryhttps://bugzilla.suse.com/952196
- advisoryhttps://mta.openssl.org/pipermail/openssl-announce/2015-July/000037.html
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2015-1793
FAQ
Common Questions.
The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certifi…
Affected: Openssl versions 1.0.1n, 1.0.1o, 1.0.2b, 1.0.2c; Jd Edwards Enterpriseone Tools (Oracle) versions 9.1, 9.2; Supply Chain Products Suite (Oracle) versions 6.1.2.2, 6.1.3.0, 6.2.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including libmysql55client_r18 5.5.46-0.14.1, libmysql55client_r18-32bit 5.5.46-0.14.1, libmysql55client_r18-x86 5.5.46-0.14.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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