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NVD / CVE Program· CNA redhat

CVE-2016-2177: OpenSSL through 1.0.2h incorrectly uses pointer arithmetic for heap-buffer boundary checks, which might allow remote attackers to cause a…

CriticalCVSS 9.8 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Plan (action score 52/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 44.5% (FIRST EPSS); higher than 98.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: openssl (Alpine:v3.2) 1.0.2h-r1; openssl (Debian:12) 1.0.2i-1; openssl (Debian:7) 1.0.1t-1+deb7u1.

Add it to your regular patch cycle. Upgrade to openssl (Alpine:v3.2) 1.0.2h-r1; openssl (Debian:12) 1.0.2i-1; openssl (Debian:7) 1.0.1t-1+deb7u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

OpenSSL through 1.0.2h incorrectly uses pointer arithmetic for heap-buffer boundary checks, which might allow remote attackers to cause a denial of service (integer overflow and application crash) or possibly have unspecified other impact by leveraging unexpected malloc behavior, related to s3_srvr.c, ssl_sess.c, and t1_lib.c.

Published
Jun 19, 2016
Updated
Jun 16, 2026
EPSS
44.5% · 98th percentile

Report tools

JSON

Action score

52

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
13 / 30 · 44.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2016-2177

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opensslopenssl
hpicewall mcrp
hpicewall sso
hpicewall sso agent option
oraclelinux
oraclesolaris

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The OpenSSL version can't be seen from outside; the free SSL checker tests your certificate, enabled TLS versions and weak ciphers. Confirm the version on your server with the package manager.

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • hp icewall mcrp3.0
  • hp icewall sso10.0
  • hp icewall sso agent option10.0
  • openssl openssl1.0.1
  • openssl openssl1.0.1a
  • openssl openssl1.0.1b
  • openssl openssl1.0.1c
  • openssl openssl1.0.1d
+12 more rows
  • openssl openssl1.0.1e
  • openssl openssl1.0.1f
  • openssl openssl1.0.1g
  • openssl openssl1.0.1h
  • openssl openssl1.0.1i
  • openssl openssl1.0.1j
  • openssl openssl1.0.1k
  • openssl openssl1.0.1l
  • openssl openssl1.0.1m
  • openssl openssl1.0.1n
  • openssl openssl1.0.1o
  • openssl openssl1.0.1p

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.2opensslbefore 1.0.2h-r11.0.2h-r1
Debian:12opensslbefore 1.0.2i-11.0.2i-1
Debian:7opensslbefore 1.0.1t-1+deb7u11.0.1t-1+deb7u1
Debian:8opensslbefore 1.0.1t-1+deb8u41.0.1t-1+deb8u4
Red Hat:enterprise_linux:6::clientopensslbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-debuginfobefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-develbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-perlbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-staticbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:7::clientopensslbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-debuginfobefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-develbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-libsbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-perlbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-staticbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpdbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-debuginfobefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-develbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-manualbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-selinuxbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-src-zipbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-toolsbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-zipbefore 0:2.4.23-102.jbcs.el60:2.4.23-102.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_auth_kerbbefore 0:5.4-35.jbcs.el60:5.4-35.jbcs.el6

+85

Same product

openssl: all records

Other 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…KEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This 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

Published before and after this one in the same product

  • ← EarlierCVE-2016-2176May 4, 2016 · The X509_NAME_oneline function in crypto/x509/x509_obj.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to obtain…
    39Monitor
  • ← EarlierCVE-2000-1254May 5, 2016 · crypto/rsa/rsa_gen.c in OpenSSL before 0.9.6 mishandles C bitwise-shift operations that exceed the size of an expression, which makes it…
    31Monitor
  • Later →CVE-2016-2178Jun 19, 2016 · The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure the use of constant-time…
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:openssl1.0.2h-r1 · Alpine:v3.2Package registry (OSV)
debian:openssl1.0.2i-1 · Debian:12Package registry (OSV)
red hat:jbcs-httpd24-httpd0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-manual0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-selinux0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-src-zip0:2.4.23-102.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:openssl0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-debuginfo0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-devel0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-libs1:1.0.1e-51.el7_2.7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-perl0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-static0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
suse:compat-openssl097g0.9.7g-146.22.47.1 · SUSE:Linux Enterprise Server for SAP Applications 11 SP3Package registry (OSV)
suse:compat-openssl0980.9.8j-102.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)
suse:openssl1.0.1i-27.21.1 · SUSE:Linux Enterprise Server for SAP Applications 12Package registry (OSV)
suse:openssl11.0.1g-0.52.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

ATT&CK techniques

—

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records