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CVE Record

CVE-2017-5469: Fixed potential buffer overflows in generated Firefox code due to CVE-2016-6354 issue in Flex.

Fixed potential buffer overflows in generated Firefox code due to CVE-2016-6354 issue in Flex. 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 analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2017-5469 concerns possible buffer overflows in Firefox-generated code caused by a Flex issue. It affected older Firefox, Firefox ESR, and Thunderbird releases. The sources do not provide CVSS severity or active exploitation evidence, so urgency depends mainly on whether unsupported legacy Mozilla clients remain in use.

Executive priority

Prioritize this as a legacy software risk. It is not supported here as actively exploited, but affected browser and mail clients are old enough that finding them should trigger upgrade or removal work.

Technical view

Mozilla fixed potential buffer overflows in generated Firefox code related to CVE-2016-6354 in Flex. Affected versions are Thunderbird before 52.1, Firefox ESR before 45.9 and 52.1, and Firefox before 53. The provided record does not include CWE, CVSS, exploit details, or a confirmed attack path.

Likely exposure

Exposure is most likely on legacy endpoints, servers, or gold images still running affected Mozilla Firefox, Firefox ESR, or Thunderbird versions from before the 2017 fixes.

Exploitation context

The supplied bundle marks this CVE as not in KEV and provides no cited evidence of active exploitation. Treat it as a memory-safety concern with incomplete public severity context rather than confirmed exploited activity.

Researcher notes

The evidence names affected products and fixed-version thresholds, but omits CVSS, CWE, exploitability details, and proof-of-exploitation. Analysis should stay tied to version validation and vendor advisory review rather than assuming remote code execution or exploitation in the wild.

Mitigation direction

  • Upgrade Firefox to version 53 or later, or a currently supported release.
  • Upgrade Firefox ESR to 45.9, 52.1, or a currently supported ESR release.
  • Upgrade Thunderbird to 52.1 or later, preferably a supported release.
  • Apply relevant Red Hat or Debian security updates where Mozilla packages are OS-managed.
  • Check Mozilla and OS vendor advisories for environment-specific guidance.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions across endpoints and server images.
  • Flag Firefox versions below 53 and Thunderbird versions below 52.1.
  • Flag Firefox ESR versions below 45.9 or 52.1, depending on the ESR branch.
  • Verify Red Hat and Debian package update status against their 2017 advisories.
  • Confirm unsupported legacy Mozilla binaries are removed from managed images.
Prepared
Confidence
medium
Sources
11

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

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CVE-2017-5469 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.