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FirefoxWeb browser · Mozilla

CVE-2016-2836

HIGH · 8.8 CVSS v3.0 Published 2016-08-05
Fix available
A fix is available. Upgrade to after 47.0.1 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

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
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors related to Http2Session::Shutdown and SpdySession31::Shutdown, and other vectors.

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 · high confidence

Memory corruption vulnerability in Mozilla Firefox's browser engine related to HTTP/2 (Http2Session::Shutdown) and SPDY (SpdySession31::Shutdown) session handling. Remote attackers can trigger memory corruption leading to denial of service (application crash) or potentially achieve arbitrary code execution via crafted web content.

MitigationUpgrade Firefox to version 48.0 or later (or Firefox ESR 45.3 or later for ESR releases) to remediate these memory corruption vulnerabilities in the HTTP/2 and SPDY session shutdown code paths.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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
FirefoxWeb browser
Affected:<= 47.0.1= 45.1.0= 45.1.1= 45.2.0= 45.3.0

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
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Firefox version number
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number is displayed in the window that opens.
    Affected if The installed version is 45.1.0, 45.1.1, 45.2.0, 45.3.0, or any version 47.0.1 or lower
  2. Verify HTTP/2 protocol support is enabled
    In the Firefox address bar, type about:config and press Enter. In the search box, search for network.http.http2.enabled. Check if the value is set to true.
    Affected if network.http.http2.enabled is set to true (enabled) - this enables the vulnerable Http2Session::Shutdown code path
  3. Verify SPDY protocol support is enabled
    In the Firefox address bar, type about:config and press Enter. In the search box, search for network.http.spdy.enabled. Check if the value is set to true.
    Affected if network.http.spdy.enabled is set to true (enabled) - this enables the vulnerable SpdySession31::Shutdown code path

You are affected if your Firefox version falls within 45.1.0-45.3.0, 47.0.1, or any version <=47.0.1 AND either HTTP/2 or SPDY protocol support is enabled in your browser settings.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

From vendor data
Upgrade available Upgrade to a release after 47.0.1
Interim mitigation

Upgrade Firefox to version 48.0 or later (or Firefox ESR 45.3 or later for ESR releases) to remediate these memory corruption vulnerabilities in the HTTP/2 and SPDY session shutdown code paths.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

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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-2016-2836 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data