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CVE-2021-29454

Vulnerability in smarty/smarty (CVE-2021-29454)

Summary

Vulnerability in smarty/smarty (CVE-2021-29454). Confidential information can be exposed externally. Mitigation: upgrade to 4.0.2 or later.

Original description

The description as published by the source.

Impact

Template authors could run arbitrary PHP code by crafting a malicious math string.
If a math string is passed through as user provided data to the math function, external users could run arbitrary PHP code by crafting a malicious math string.

Patches

Please upgrade to 4.0.2 or 3.1.42 or higher.

References

See documentation on Math function.

For more information

If you have any questions or comments about this advisory please open an issue in the Smarty repo

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory 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 CVE-2021-29454 has been found in smarty/smarty.
Confidential information can be exposed externally.
What to do: upgrade smarty/smarty to 4.0.2 or later.
If unsure, ask your IT team or search "smarty/smarty CVE-2021-29454" on the vendor's site.

CVE-2021-29454 (smarty/smarty) — CWE-74
Attack vector: remote (network-reachable) / unauthenticated
Patched: 4.0.2 — 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 (CWE-74) exists in smarty/smarty.

📍 Affected scope

Check the vendor advisory for the affected versions of smarty/smarty.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 4.0.2.

🛡️ 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 'smarty/smarty' . 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. 1
    Identify exposure identify 
    grep -r 'smarty/smarty' . | 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 smarty/smarty を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade smarty/smarty to 4.0.2

    ステージング環境で 4.0.2 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. 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

Packagist smarty/smarty
[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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