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CVE Record

CVE-2017-5445: A vulnerability while parsing "application/http-index-format" format content where uninitialized values are...

A vulnerability while parsing "application/http-index-format" format content where uninitialized values are used to create an array. This could allow the reading of uninitialized memory into the arrays affected. 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-2017-5445 is a Mozilla memory disclosure issue in older Firefox, Firefox ESR, and Thunderbird releases. When handling application/http-index-format content, affected software could place uninitialized memory into arrays, potentially exposing data from the process. The sources do not show active exploitation or a CVSS score.

Executive priority

Prioritize remediation if legacy Mozilla clients remain in the environment, especially on systems handling untrusted web or email content. For fully supported, updated fleets, urgency is lower but still requires verification.

Technical view

The flaw occurs while parsing application/http-index-format content. Uninitialized values are used to create an array, allowing uninitialized memory to be read into affected arrays. Affected products are Thunderbird before 52.1, Firefox ESR before 45.9 and 52.1, and Firefox before 53.

Likely exposure

Exposure is limited to legacy Mozilla installations: Thunderbird below 52.1, Firefox ESR below 45.9 or 52.1, and Firefox below 53. Modern supported versions should not be assumed affected from this bundle.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. It describes a memory-read condition, not code execution. Treat exploitability details as incomplete unless vendor advisories or internal telemetry show more.

Researcher notes

Evidence is sparse: no CVSS, CWE, or exploit confirmation is included. The key technical point is uninitialized memory exposure during content parsing. Focus research on vendor advisories and Bugzilla 1344467, without assuming broader product impact.

Mitigation direction

  • Upgrade Thunderbird to 52.1 or later where still relevant.
  • Upgrade Firefox to 53 or later.
  • Upgrade Firefox ESR to 45.9, 52.1, or later supported ESR.
  • Review Mozilla, Debian, and Red Hat advisories for distribution-specific packages.
  • Retire unsupported legacy Mozilla clients from managed environments.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions.
  • Check Linux package versions against Debian and Red Hat advisory fixes.
  • Confirm no endpoints run versions listed as below fixed releases.
  • Review vulnerability scanner results for CVE-2017-5445 on legacy systems.
  • Document exceptions where unsupported clients cannot be upgraded.
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-2017-5445 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.