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CVE Record

CVE-2017-7802: A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image elem...

A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image element. If these elements have been freed due to a lack of strong references, a potentially exploitable crash may occur when the freed elements are accessed. 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

CVE-2017-7802 is a Mozilla client-side memory safety flaw. A crafted page or message content could trigger unsafe access to already-freed image-related DOM objects during resize handling, causing a potentially exploitable crash. The sources identify affected versions as Firefox before 55, Firefox ESR before 52.3, and Thunderbird before 52.3.

Executive priority

Prioritize remediation where legacy Mozilla browsers or Thunderbird remain in use, especially on user workstations. This is an older issue, but browser and mail-client memory flaws can carry high business impact when unpatched clients encounter untrusted web or message content.

Technical view

The vulnerability is a use-after-free involving DOM manipulation during an image element resize event. If image-related elements are freed because strong references are missing, later access can crash the process. The bundle does not provide CVSS, CWE, confirmed code execution, or exploit-in-the-wild evidence.

Likely exposure

Exposure is most likely on legacy desktops, servers, or packaged Linux environments still running Firefox below 55, Firefox ESR below 52.3, or Thunderbird below 52.3. Modern supported installations should already be beyond the affected versions, but older enterprise images and unmanaged mail clients warrant checking.

Exploitation context

The sources describe a potentially exploitable crash but do not state active exploitation. CISA KEV status is false in the provided bundle. Treat exploit status as unconfirmed unless later vendor, KEV, or threat-intelligence sources say otherwise.

Researcher notes

The bundle gives the vulnerable condition and fixed-version thresholds but omits CVSS, CWE classification, exploitability proof, and patch internals. Analysis should stay bounded to Mozilla and distribution advisories, with validation focused on version exposure rather than exploit testing.

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 Debian, Red Hat, or Gentoo vendor updates where those packages are managed by the OS.
  • Check Mozilla and distribution advisories for any environment-specific guidance.

Validation and detection

  • Inventory Firefox, Firefox ESR, and Thunderbird versions across managed assets.
  • Confirm no installed Firefox version is below 55.
  • Confirm no Firefox ESR or Thunderbird version is below 52.3.
  • Check Linux package records against Debian, Red Hat, or Gentoo advisories as applicable.
  • Review legacy golden images and offline systems for outdated browser or mail clients.
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-2017-7802 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.