Vulnerability in wordpress (DEBIAN-CVE-2021-29447)

Summary

Vulnerability in wordpress (DEBIAN-CVE-2021-29447). Confidential information can be exposed externally. Mitigation: upgrade to 5.7.1+dfsg1-1 or later.

Original description

The description as published by the source.

Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

Source: OSV.dev (Open Source Vulnerabilities) OSV

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 DEBIAN-CVE-2021-29447 has been found in wordpress.
Confidential information can be exposed externally.
What to do: upgrade wordpress to 5.7.1+dfsg1-1 or later.
If unsure, ask your IT team or search "wordpress DEBIAN-CVE-2021-29447" on the vendor's site.

DEBIAN-CVE-2021-29447 (wordpress)
Attack vector: remote (network-reachable) / no user interaction
Patched: 5.7.1+dfsg1-1 — apply immediately
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 (unclassified) exists in wordpress.

📍 Affected scope

Check the vendor advisory for the affected versions of wordpress.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 5.7.1+dfsg1-1.

🛡️ 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 'wordpress' . 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 'wordpress' . | 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 wordpress を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade wordpress to 5.7.1+dfsg1-1
```
ステージング環境で 5.7.1+dfsg1-1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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。

Affected packages

Debian:11 wordpress

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.1+dfsg1-1"}]}]

Debian:12 wordpress

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.1+dfsg1-1"}]}]

Debian:13 wordpress

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.1+dfsg1-1"}]}]

Debian:14 wordpress

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.1+dfsg1-1"}]}]

References

advisory security-tracker.debian.org