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CVE Record

CVE-2017-5429: Memory safety bugs were reported in Firefox 52, Firefox ESR 45.8, Firefox ESR 52, and Thunderbird 52.

Memory safety bugs were reported in Firefox 52, Firefox ESR 45.8, Firefox ESR 52, and Thunderbird 52. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. 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 analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2017-5429 is a set of Mozilla memory safety bugs affecting older Firefox, Firefox ESR, and Thunderbird releases. Mozilla reported memory corruption and presumed some issues could be exploited to run arbitrary code. Business risk is mainly from legacy clients still installed or packaged through older Linux distributions.

Executive priority

Prioritize remediation where old Mozilla clients remain in production or on user endpoints. This is not a current KEV-backed emergency from the provided evidence, but legacy exposure can still carry high impact because arbitrary code execution was considered plausible.

Technical view

The CVE covers multiple memory safety defects in Firefox 52, Firefox ESR 45.8/52, and Thunderbird 52. Affected versions are Thunderbird before 52.1, Firefox ESR before 45.9 or 52.1, and Firefox before 53. Mozilla’s description states some bugs showed memory corruption and could potentially enable arbitrary code execution.

Likely exposure

Exposure is most likely on unmanaged workstations, legacy virtual desktops, kiosks, or servers with old Mozilla packages installed. Current supported browsers and mail clients should not be affected if upgraded beyond the fixed versions named by Mozilla and distribution advisories.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. The risk comes from memory corruption in software that processes web or email content, with Mozilla stating arbitrary code execution may be possible with enough effort.

Researcher notes

Evidence is aggregated and incomplete: no CVSS, CWE, or individual exploitability details are provided in the bundle. Bugzilla references list related bugs, but the CVE summary does not specify exact crash primitives, affected components, or exploit conditions.

Mitigation direction

  • Upgrade Firefox to version 53 or later.
  • Upgrade Firefox ESR to 45.9, 52.1, or later.
  • Upgrade Thunderbird to 52.1 or later.
  • Apply relevant Red Hat or Debian security updates where those packages are used.
  • Check Mozilla and OS vendor advisories for any environment-specific guidance.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Confirm no Firefox installations are older than version 53.
  • Confirm Firefox ESR is not older than 45.9 or 52.1.
  • Confirm Thunderbird is not older than 52.1.
  • Review package manager records against Red Hat and Debian advisories.
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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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2017-5429 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.