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CVE Record

CVE-2017-7786: A buffer overflow can occur when the image renderer attempts to paint non-displayable SVG elements.

A buffer overflow can occur when the image renderer attempts to paint non-displayable SVG elements. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Older Firefox, Firefox ESR, and Thunderbird versions can crash in a potentially exploitable way when rendering certain SVG content. For executives, the risk is mainly from legacy browsers or mail clients still in use, especially where users open untrusted web pages or email content.

Executive priority

Prioritize remediation if any legacy Mozilla clients remain in production. This is old, but browser and mail-client memory corruption can carry high user-driven risk when untrusted content is rendered.

Technical view

CVE-2017-7786 is a Mozilla image-rendering buffer overflow triggered while painting non-displayable SVG elements. The source bundle lists Thunderbird before 52.3, Firefox ESR before 52.3, and Firefox before 55 as affected. No CVSS, CWE, or KEV exploitation evidence is provided.

Likely exposure

Exposure is most likely on unmanaged or legacy endpoints running Firefox before 55, Firefox ESR before 52.3, or Thunderbird before 52.3. Modern patched installations should not be exposed based on the affected-version ranges provided.

Exploitation context

The sources describe a potentially exploitable crash, but the bundle does not provide public exploitation evidence and KEV is false. Treat this as a serious memory-corruption issue without claiming active exploitation.

Researcher notes

Evidence is sufficient for affected product and version boundaries, but incomplete for CVSS, CWE, root-cause details, and exploit maturity. Use vendor advisories and package errata for final validation rather than assuming exploitability beyond the reported crash.

Mitigation direction

  • Upgrade Firefox to version 55 or later.
  • Upgrade Firefox ESR to version 52.3 or later.
  • Upgrade Thunderbird to version 52.3 or later.
  • Apply relevant Debian, Red Hat, or Gentoo vendor packages where applicable.
  • Retire unsupported legacy browser and mail-client builds.

Validation and detection

  • Inventory endpoint Firefox, Firefox ESR, and Thunderbird versions.
  • Confirm no installations remain below the fixed version thresholds.
  • Check Linux package advisories for applied Mozilla security updates.
  • Review vulnerability scanner findings against the affected product versions.
  • Prioritize systems that process untrusted web or email content.
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

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-2017-7786 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 ESRunspecifiedListed
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.