CVE-2016-6303
CRITICALCVSS 9.8/10EPSS 31.99%
Last modified
CVE-2016-6303 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have unspecified other impact via unknown vectors.. EPSS estimates a 31.99% chance of exploitation in the next 30 days.
Description
Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have unspecified other impact via unknown vectors.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nodejs | Node.Js | < 0.12.16 |
| Nodejs | Node.Js | >= 4.0.0, < 4.6.0 |
| Nodejs | Node.Js | >= 6.0.0, < 6.6.0 |
| Openssl | Openssl | 1.0.1 |
| Openssl | Openssl | 1.0.1a |
| Openssl | Openssl | 1.0.1b |
| Openssl | Openssl | 1.0.1c |
| Openssl | Openssl | 1.0.1d |
| Openssl | Openssl | 1.0.1e |
| Openssl | Openssl | 1.0.1f |
| Openssl | Openssl | 1.0.1g |
| Openssl | Openssl | 1.0.1h |
| Openssl | Openssl | 1.0.1i |
| Openssl | Openssl | 1.0.1j |
| Openssl | Openssl | 1.0.1k |
| Openssl | Openssl | 1.0.1l |
| Openssl | Openssl | 1.0.1m |
| Openssl | Openssl | 1.0.1n |
| Openssl | Openssl | 1.0.1o |
| Openssl | Openssl | 1.0.1p |
| Openssl | Openssl | 1.0.1q |
| Openssl | Openssl | 1.0.1r |
| Openssl | Openssl | 1.0.1s |
| Openssl | Openssl | 1.0.1t |
| Openssl | Openssl | 1.0.2 |
| Openssl | Openssl | 1.0.2a |
| Openssl | Openssl | 1.0.2b |
| Openssl | Openssl | 1.0.2c |
| Openssl | Openssl | 1.0.2d |
| Openssl | Openssl | 1.0.2e |
| Openssl | Openssl | 1.0.2f |
| Openssl | Openssl | 1.0.2g |
| Openssl | Openssl | 1.0.2h |
References
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/92984Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036885Third Party Advisory, VDB Entry
- https://bto.bluecoat.com/security-advisory/sa132Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1370146Issue Tracking, Patch, Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312Third Party Advisory
- https://nodejs.org/en/blog/vulnerability/september-2016-security-releases/Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.ascThird Party Advisory
- https://www.tenable.com/security/tns-2016-16Third Party Advisory
- https://www.tenable.com/security/tns-2016-20Third Party Advisory
- https://www.tenable.com/security/tns-2016-21Third Party Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/92984Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036885Third Party Advisory, VDB Entry
- https://bto.bluecoat.com/security-advisory/sa132Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1370146Issue Tracking, Patch, Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312Third Party Advisory
- https://nodejs.org/en/blog/vulnerability/september-2016-security-releases/Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.ascThird Party Advisory
- https://www.tenable.com/security/tns-2016-16Third Party Advisory
- https://www.tenable.com/security/tns-2016-20Third Party Advisory
- https://www.tenable.com/security/tns-2016-21Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-6303?
Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have unspecified other impact via unknown vectors.
How severe is CVE-2016-6303?
CVE-2016-6303 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 31.99% probability of exploitation in the next 30 days.
How do I fix CVE-2016-6303?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2016
- CVE-2016-6297Integer overflow in the php_stream_zip_opener function in ex…
- CVE-2016-6298The _Rsa15 class in the RSA 1.5 algorithm implementation in …5.3
- CVE-2016-6299The scm plug-in in mock might allow attackers to bypass the …
- CVE-2016-6300Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultI…
- CVE-2016-6301The recv_and_process_client_pkt function in networking/ntpd.…7.5
- CVE-2016-6302The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL b…
- CVE-2016-6304Multiple memory leaks in t1_lib.c in OpenSSL before 1.0.1u, …7.5
- CVE-2016-6305The ssl3_read_bytes function in record/rec_layer_s3.c in Ope…
- CVE-2016-6306The certificate parser in OpenSSL before 1.0.1u and 1.0.2 be…5.9
- CVE-2016-6307The state-machine implementation in OpenSSL 1.1.0 before 1.1…
- CVE-2016-6308statem/statem_dtls.c in the DTLS implementation in OpenSSL 1…
- CVE-2016-6309statem/statem.c in OpenSSL 1.1.0a does not consider memory-b…
Are you affected by CVE-2016-6303?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST