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OpenSSLFramework / library

CVE-2016-2177

CRITICAL · 9.8 CVSS v3.0 Published 2016-06-20
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
OpenSSLFramework / library
Affected:= 1.0.1= 1.0.1a= 1.0.1b= 1.0.1c= 1.0.1d= 1.0.1e= 1.0.1f= 1.0.1g= 1.0.1h= 1.0.1i= 1.0.1j= 1.0.1k
LinuxOperating system
Affected:= 5= 6= 7
Icewall McrpApplication
Affected:= 3.0
Icewall SsoApplication
Affected:= 10.0
Icewall Sso Agent OptionApplication
Affected:= 10.0
SolarisOperating system
Affected:= 10= 11.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch bugzilla.redhat.com →
Recommended fix Moderate confidence

OpenSSL 1.0.2i or later (1.0.2 series) or OpenSSL 1.1.0 or later (1.1.x series)

  1. Identify the OpenSSL version currently installed by running 'openssl version' or checking the package manager
  2. Stop all services that depend on OpenSSL (e.g., web servers, mail servers, VPN services)
  3. Upgrade OpenSSL to version 1.0.2i or later in the 1.0.2 series, or to 1.1.0 or later in the 1.1.x series
  4. Verify the new OpenSSL version with 'openssl version'
  5. Restart all services that depend on OpenSSL
  6. On affected Linux systems, also update the openssl-libs package via the system package manager
  7. On affected Solaris systems, apply the appropriate Oracle security patch for OpenSSL
Caveat Upgrading OpenSSL may require recompiling applications that link against it; some older applications may have compatibility issues with newer OpenSSL versions

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2016-2177 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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