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CVE Record

CVE-2025-66287: Webkitgtk: processing maliciously crafted web content may lead to an unexpected process crash

A flaw was found in WebKitGTK. Processing malicious web content can cause an unexpected process crash due to improper memory handling.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2025-66287 is a high-severity WebKitGTK memory-handling flaw. If a user or application processes malicious web content, the WebKitGTK process may crash. Red Hat lists multiple RHEL streams and WebKitGTK-related packages as affected. Treat this as urgent for Linux desktops, embedded browsers, and applications that render untrusted web content.

Executive priority

Prioritize patching in the next regular security window, faster for systems that browse or render untrusted content. There is no sourced evidence of active exploitation, but the high CVSS score and broad RHEL package exposure warrant prompt action.

Technical view

The source describes improper memory handling in WebKitGTK, mapped to CWE-120, with CVSS 3.1 score 8.8. Attack vector is network, low complexity, no privileges required, but user interaction is required. The description confirms unexpected process crash; the CVSS vector also rates confidentiality, integrity, and availability impacts as high.

Likely exposure

Most likely exposure is on Red Hat Enterprise Linux systems using webkitgtk, webkitgtk3, webkitgtk4, or webkit2gtk3 packages, especially applications embedding WebKitGTK to render external or user-controlled web content.

Exploitation context

The bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires maliciously crafted web content to be processed, with user interaction indicated by the CVSS vector. No exploit details are provided in the sources.

Researcher notes

Evidence is strongest for Red Hat package exposure and the WebKitGTK crash condition. The source bundle does not include proof-of-concept details, exploit confirmation, or detailed root-cause analysis beyond improper memory handling and CWE-120. Avoid assuming code execution unless vendor sources add that detail.

Mitigation direction

  • Apply the applicable Red Hat RHSA updates for affected RHEL streams.
  • Check WebKitGTK security advisory WSA-2025-0009 for upstream guidance.
  • Reduce exposure to untrusted web content until affected packages are updated.
  • Prioritize systems running GUI or embedded-browser applications that use WebKitGTK.
  • Track vendor advisories for fixed package versions and reboot requirements.

Validation and detection

  • Inventory installed webkitgtk, webkitgtk3, webkitgtk4, and webkit2gtk3 packages.
  • Map systems to the affected RHEL versions listed in the CVE source bundle.
  • Confirm whether relevant Red Hat advisories are applied on each system.
  • Review applications that embed WebKitGTK and process external content.
  • Monitor vendor advisories for updated fixed-version details.
Prepared
Confidence
medium
Sources
12

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-120: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2025-66287 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

1CVSS vectors
5Timeline events
1ADP providers
15Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9redhat

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2025-66287Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. Source timelineredhat

    Made public.

  3. Source timelineredhat

    Reported to Red Hat.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
The WebKitGTK TeamWebKitGTKwebkitgtk, 0unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportwebkitgtk4, 0:2.50.3-2.el7_9affected
Red HatRed Hat Enterprise Linux 8webkit2gtk3, 0:2.50.3-1.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportwebkit2gtk3, 0:2.50.3-2.el8_2affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportwebkit2gtk3, 0:2.50.3-2.el8_4affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onwebkit2gtk3, 0:2.50.3-2.el8_4affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportwebkit2gtk3, 0:2.50.3-2.el8_6affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicewebkit2gtk3, 0:2.50.3-2.el8_6affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionswebkit2gtk3, 0:2.50.3-2.el8_6affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicewebkit2gtk3, 0:2.50.3-2.el8_8affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionswebkit2gtk3, 0:2.50.3-2.el8_8affected
Red HatRed Hat Enterprise Linux 9webkit2gtk3, 0:2.50.3-1.el9_7affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionswebkit2gtk3, 0:2.50.3-1.el9_0affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionswebkit2gtk3, 0:2.50.3-1.el9_2affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportwebkit2gtk3, 0:2.50.3-1.el9_4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportwebkit2gtk3, 0:2.50.3-1.el9_6affected
Red HatRed Hat Enterprise Linux 6webkitgtkunknown
Red HatRed Hat Enterprise Linux 7webkitgtk3affected
Weakness

CWE details

CWE-120

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-120 · source CWE mapping

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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