Buffer Overflow in WebKitGTK (CVE-2019-8720, CVSS 8.8, KEV)

Summary

Vulnerability in WebKitGTK (CVE-2019-8720). Successful exploitation can lead to full system takeover. Listed in CISA KEV — actively exploited.

Original description

The description as published by the source.

WebKitGTK contains a memory corruption vulnerability which can allow an attacker to perform remote code execution.

Source: CISA Known Exploited Vulnerabilities NVD CISA KEV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2019-8720 has been found in WebKitGTK.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
Note: CISA has officially confirmed this is actively exploited in the wild. Treat it with elevated urgency.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "WebKitGTK CVE-2019-8720" on the vendor's site.

CVE-2019-8720 (WebKitGTK) — CWE-119 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Listed in CISA KEV — actively exploited, treat as top priority.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-119) exists in WebKitGTK.

📍 Affected scope

Check the vendor advisory for the affected versions of WebKitGTK.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover. Listed in CISA KEV — actively exploited in the wild, treat as top priority.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'WebKitGTK' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'WebKitGTK' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で WebKitGTK を grep し、稼働しているサービス・バージョンを把握する。
2
Consider incident declaration escalate
```
Notify SOC / on-call
```
CISA KEV登録済 = 実環境で悪用が観測されている。侵入の兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

advisory NVD
advisory bugzilla.redhat.com
patch webkitgtk.org
web cisa.gov