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CVE Record

CVE-2017-5446: An out-of-bounds read when an HTTP/2 connection to a servers sends "DATA" frames with incorrect data content.

An out-of-bounds read when an HTTP/2 connection to a servers sends "DATA" frames with incorrect data content. This leads to a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2017-5446 is a Mozilla HTTP/2 parsing flaw. A malicious or faulty server could send malformed DATA frames that make affected Firefox, Firefox ESR, or Thunderbird versions crash. The sources describe the crash as potentially exploitable, but do not provide CVSS, CWE, or confirmed exploitation evidence.

Executive priority

Treat this as a legacy-client hygiene issue unless vulnerable versions remain in production. Prioritize remediation where old browsers or mail clients access untrusted web content, because the flaw is remotely triggerable through HTTP/2 handling and described as potentially exploitable.

Technical view

The issue is an out-of-bounds read triggered by incorrect HTTP/2 DATA frame content. Affected products are Thunderbird before 52.1, Firefox ESR before 45.9 and 52.1, and Firefox before 53. Mozilla, Red Hat, and Debian advisories are referenced, indicating vendor-fixed packages existed in 2017.

Likely exposure

Exposure is mainly legacy Mozilla clients or distro-packaged Firefox/Thunderbird builds from 2017-era systems. Modern, supported versions should not be affected if vendor security updates were applied. Servers are not listed as affected products in the provided sources.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation reports. Exploitation would require an affected client to process malformed HTTP/2 DATA frames from a server. The provided description supports crash risk and possible exploitability, not confirmed remote code execution.

Researcher notes

Key gaps are absent CVSS, CWE, and exploit telemetry in the supplied bundle. Focus validation on version evidence and vendor advisory mapping. Do not assume affected server-side products; the listed affected products are Mozilla client applications.

Mitigation direction

  • Upgrade Firefox to version 53 or later.
  • Upgrade Firefox ESR to 45.9, 52.1, or later supported ESR.
  • Upgrade Thunderbird to 52.1 or later.
  • Apply relevant Red Hat or Debian security updates where using distro packages.
  • Check Mozilla and OS vendor guidance for unsupported legacy systems.

Validation and detection

  • Inventory Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Confirm no Firefox versions earlier than 53 remain in use.
  • Confirm Firefox ESR is at least 45.9 or 52.1, depending on branch.
  • Confirm Thunderbird is at least 52.1.
  • Review Linux package advisory status for RHSA-2017:1104, RHSA-2017:1106, and DSA-3831.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2017-5446 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
10Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaThunderbirdunspecifiedListed
MozillaFirefox ESRunspecified, unspecifiedListed
MozillaFirefoxunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.