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Fencer Vulns
critical 9.8

CVE-2016-6303 in the critical feed json

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…

published 2016-09-16 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7232

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
32.0%
EPSS 32.0% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

  • nodejs node.js 0.12.16, 4.6.0, 6.6.0
  • openssl Debian 14, Debian 13, Debian 12 1.0.2i-1

debian advisories DEBIAN-CVE-2016-6303

  • openssl Ubuntu 14.04 LTS 1.0.1f-1ubuntu2.20
  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.4

ubuntu advisories UBUNTU-CVE-2016-6303

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • compat-openssl098 SLES for SAP 12 SP1, SLED 12 SP1, SLE Module for Legacy 12 0.9.8j-102.1
  • openssl1 SLES 11-SECURITY 1.0.1g-0.52.1
  • openssl Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +8 more 0.9.8j-0.102.2
  • openssl SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 1.0.1i-52.1
  • compat-openssl097g SLES for SAP 11 SP4, SLES for SAP 11 SP3 0.9.7g-146.22.47.1
  • openssl SLES for SAP 12, SLES 12-LTSS 1.0.1i-27.21.1

suse advisories SUSE-SU-2016:2545-1SUSE-SU-2016:2468-1SUSE-SU-2016:2469-1SUSE-SU-2016:2458-1SUSE-SU-2016:2394-1SUSE-SU-2016:2387-1

  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2

opensuse advisories openSUSE-SU-2024:11127-1

  • openssl Alpine 3.8, Alpine 3.7, Alpine 3.6 +4 more 1.0.2h-r3

alpine advisories ALPINE-CVE-2016-6303

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl Arch Linux 1.0.2.i-1
  • lib32-openssl Arch Linux 1:1.0.2.i-1

arch linux advisories AVG-29AVG-30

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-6303 updated cvss 6.5

openssl: Integer overflow in MDC2_Update()

  • Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 OVMF, openssl, openssl098e, openssl-libs, openssl-perl Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 1 openssl Red Hat JBoss Enterprise Web Server 2 openssl
    +1 more products
    Red Hat JBoss Enterprise Web Server 3 openssl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-22-349-21 updated cvss 9.8

Siemens SCALANCE X-200RNA Switch Devices

  • Siemens SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2) <V3.2.7 Siemens SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2) <V3.2.7 Siemens SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP) (6GK5204-0BS00-3LA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP/HSR) (6GK5204-0BS00-3PA3) <V3.2.7
    affected: fixed in V3.2.7, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

31.99% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.