CVE-2016-2177

CRITICALEPSS 99th pctl

9.8

CVSS v3

Description

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.

CWE-190Integer Overflow

How to fix

Remediation Available

opensslDebian

Fixed in:1.0.2i-1CVE-2016-2177

libssl1.0.0Ubuntu

Fixed in:1.0.1f-1ubuntu2.20USN-3087-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.0.1f-1ubuntu2.22USN-3181-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.0.2g-1ubuntu4.6USN-3181-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.0.2g-1ubuntu4.4USN-3087-1

This Ubuntu release reached end-of-life on 2021-04-02.

opensslUbuntu

Fixed in:1.0.1f-1ubuntu2.20USN-3087-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.0.1f-1ubuntu2.22USN-3181-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.0.2g-1ubuntu4.4USN-3087-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.0.2g-1ubuntu4.6USN-3181-1

This Ubuntu release reached end-of-life on 2021-04-02.

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

44.51%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	91%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	Fix

Common questions

How do I fix CVE-2016-2177?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2016-2177 being actively exploited?

Not that we know of. CVE-2016-2177 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 44.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2016-2177?

CVE-2016-2177 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2016-2177 affect?

Published advisories record a fix for openssl (Debian), libssl1.0.0 (Ubuntu), openssl (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.