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Medium

WordPress Core < 2.1 - Denial of Service

  • Disclosed: 22.01.2007
  • Updated: 11.10.2026 10:22

The wp_remote_fopen function in WordPress before 2.1 allows remote attackers to cause a denial of service (bandwidth or thread consumption) via pingback service calls with a source URI that corresponds to a large file, which triggers a long download session without a timeout constraint.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
WordPress (core) WordPress < 2.1 2.1

References

CVSS score 4.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE)
CWE-400
Platform
WordPress
Package
WordPress
Disclosed
22.01.2007
Updated
11.10.2026 10:22

Sources and licenses

Wordfence Intelligence - 94332eb8-0961-4c8d-97bb-3d5d08e8119f - Wordfence Intelligence

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Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

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Vulnerability history: WordPress

All published vulnerabilities of this package (WordPress (core)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (385) in the archive
Total entries
385
First → latest
06.2003 10.2026
Without a fix
0
Exploited in attacks
3

Severity breakdown

  • Critical 16
  • High 95
  • Medium 263
  • Low 11

Disclosures per year

earlier: 205

Severity:
  1. WordPress Core < 2.1 - Denial of Service this entry
    Medium · 4.3 CVE-2007-0539 < 2.1 2.1
  2. WordPress Core 7.1 - 7.1.2 - Unauthenticated Stored Cross-Site Scripting via Pending Comments
    High · 7.2 4a3e3e6e-9c17-4ac5-9f83-1e01365436e9 >= 7.1.0, <= 7.1.2 7.1.3
  3. WordPress Core <= 7.1.1 - Unauthenticated Local File Inclusion via locate_template() Path Traversal
    High · 8.1 Exploited in attacks CVE-2026-87902 >= 4.7, <= 4.7.36, >= 4.8, <= 4.8.31, >= 4.9, <= 4.9.32, >= 5.0, <= 5.0.28, >= 5.1, <= 5.1.25, >= 5.2, <= 5.2.27, >= 5.3, <= 5.3.24, >= 5.4, <= 5.4.22, >= 5.5, <= 5.5.21, >= 5.6, <= 5.6.20, >= 5.7, <= 5.7.18, >= 5.8, <= 5.8.16, >= 5.9, <= 5.9.17, >= 6.0, <= 6.0.15, >= 6.1, <= 6.1.13, >= 6.2, <= 6.2.12, >= 6.3, <= 6.3.11, >= 6.4, <= 6.4.11, >= 6.5, <= 6.5.11, >= 6.6, <= 6.6.8, >= 6.7, <= 6.7.8, >= 6.8, <= 6.8.9, >= 6.9, <= 6.9.8, >= 7.0, <= 7.0.5, >= 7.1, <= 7.1.1 4.7.37, 4.8.32, 4.9.33, 5.0.29, 5.1.26, 5.2.28, 5.3.25, 5.4.23, 5.5.22, 5.6.21, 5.7.19, 5.8.17, 5.9.18, 6.0.16, 6.1.14, 6.2.13, 6.3.12, 6.4.12, 6.5.12, 6.6.9, 6.7.9, 6.8.10, 6.9.9, 7.0.6, 7.1.2
  4. WordPress Core <= 7.1 - Unauthenticated Stored Cross-Site Scripting via wpautop() Blockquote Handling
    High · 7.2 CVE-2026-93485 <= 6.6.7, >= 6.7, <= 6.7.7, >= 6.8, <= 6.8.8, >= 6.9, <= 6.9.7, >= 7.0, <= 7.0.4, = 7.1 6.6.8, 6.7.8, 6.8.9, 6.9.8, 7.0.5, 7.1.1
  5. WordPress Core <= 7.0.3 - Authenticated (Author+) Remote Code Execution via Malicious File Upload
    High · 8.8 CVE-2026-65640 >= 4.7.0, <= 4.7.34, >= 4.8.0, <= 4.8.29, >= 4.9.0, <= 4.9.30, >= 5.0.0, <= 5.0.26, >= 5.1.0, <= 5.1.23, >= 5.2.0, <= 5.2.25, >= 5.3.0, <= 5.3.22, >= 5.4.0, <= 5.4.20, >= 5.5.0, <= 5.5.19, >= 5.6.0, <= 5.6.18, >= 5.7.0, <= 5.7.16, >= 5.8.0, <= 5.8.14, >= 5.9.0, <= 5.9.15, >= 6.0.0, <= 6.0.13, >= 6.1.0, <= 6.1.11, >= 6.2.0, <= 6.2.10, >= 6.3.0, <= 6.3.9, >= 6.4.0, <= 6.4.9, >= 6.5.0, <= 6.5.9, >= 6.6.0, <= 6.6.6, >= 6.7.0, <= 6.7.6, >= 6.8.0, <= 6.8.7, >= 6.9.0, <= 6.9.6, >= 7.0.0, <= 7.0.3 4.7.35, 4.8.30, 4.9.31, 5.0.27, 5.1.24, 5.2.26, 5.3.23, 5.4.21, 5.5.20, 5.6.19, 5.7.17, 5.8.15, 5.9.16, 6.0.14, 6.1.12, 6.2.11, 6.3.10, 6.4.10, 6.5.10, 6.6.7, 6.7.7, 6.8.8, 6.9.7, 7.0.4
  6. WordPress Core 6.8 - 7.0.1 - Unauthenticated SQL Injection via author__not_in Parameter
    High · 7.5 Exploited in attacks CVE-2026-60137 >= 6.8, < 6.8.5, >= 6.9, < 6.9.5, >= 7.0, < 7.0.2 6.8.6, 6.9.5, 7.0.2
  7. WordPress Core 6.9 - 7.0.1 - Remote Code Execution via REST API Batch Request Route Confusion
    Critical · 9.8 Exploited in attacks CVE-2026-63030 >= 6.9, < 6.9.5, >= 7.0, < 7.0.2 6.9.5, 7.0.2
  8. WordPress Core < 6.5.2 - Unauthenticated & Authenticated (Contributor+) Stored Cross-Site Scripting via Avatar Block
    High · 7.2 CVE-2024-4439 >= 6.0, <= 6.0.7, >= 6.1, <= 6.1.5, >= 6.2, <= 6.2.4, >= 6.3, <= 6.3.3, >= 6.4, <= 6.4.3, >= 6.5, <= 6.5.1 6.0.8, 6.1.6, 6.2.5, 6.3.4, 6.4.4, 6.5.2
  9. WordPress Core 6.4.0 - 6.4.1 - Remote Code Execution POP Chain
    Critical · 9.8 CVE-2024-31211 = 6.4.0, = 6.4.1 6.4.2
  10. WordPress Core < 6.0.3 - SQL Injection via WP_Date_Query
    Critical · 9.8 ff4b47d8-28c1-4706-91d9-0285f419147e <= 3.6.1, >= 3.7, <= 3.7.39, >= 3.8, <= 3.8.39, >= 3.9, <= 3.9.37, >= 4.0, <= 4.0.36, >= 4.1, <= 4.1.36, >= 4.2, <= 4.2.33, >= 4.3, <= 4.3.29, >= 4.4, <= 4.4.28, >= 4.5, <= 4.5.27, >= 4.6, <= 4.6.24, >= 4.7, <= 4.7.24, >= 4.8, <= 4.8.20, >= 4.9, <= 4.9.21, >= 5.0, <= 5.0.17, >= 5.1, <= 5.1.14, >= 5.2, <= 5.2.16, >= 5.3, <= 5.3.13, >= 5.4, <= 5.4.11, >= 5.5, <= 5.5.10, >= 5.6, <= 5.6.9, >= 5.7, <= 5.7.7, >= 5.8, <= 5.8.5, >= 5.9, <= 5.9.4, >= 6.0, <= 6.0.2 3.7.40, 3.8.40, 3.9.38, 4.0.37, 4.1.37, 4.2.34, 4.3.30, 4.4.29, 4.5.28, 4.6.25, 4.7.25, 4.8.21, 4.9.22, 5.0.18, 5.1.15, 5.2.17, 5.3.14, 5.4.12, 5.5.11, 5.6.10, 5.7.8, 5.8.6, 5.9.5, 6.0.3
  11. WordPress Core < 6.0.3 - Cross-Site Request Forgery via wp-trackback.php
    High · 8.8 ddd06190-d0c1-445d-8c6f-4c7df3248db4 <= 3.6.1, >= 3.7, <= 3.7.39, >= 3.8, <= 3.8.39, >= 3.9, <= 3.9.37, >= 4.0, <= 4.0.36, >= 4.1, <= 4.1.36, >= 4.2, <= 4.2.33, >= 4.3, <= 4.3.29, >= 4.4, <= 4.4.28, >= 4.5, <= 4.5.27, >= 4.6, <= 4.6.24, >= 4.7, <= 4.7.24, >= 4.8, <= 4.8.20, >= 4.9, <= 4.9.21, >= 5.0, <= 5.0.17, >= 5.1, <= 5.1.14, >= 5.2, <= 5.2.16, >= 5.3, <= 5.3.13, >= 5.4, <= 5.4.11, >= 5.5, <= 5.5.10, >= 5.6, <= 5.6.9, >= 5.7, <= 5.7.7, >= 5.8, <= 5.8.5, >= 5.9, <= 5.9.4, >= 6.0, <= 6.0.2 3.7.40, 3.8.40, 3.9.38, 4.0.37, 4.1.37, 4.2.34, 4.3.30, 4.4.29, 4.5.28, 4.6.25, 4.7.25, 4.8.21, 4.9.22, 5.0.18, 5.1.15, 5.2.17, 5.3.14, 5.4.12, 5.5.11, 5.6.10, 5.7.8, 5.8.6, 5.9.5, 6.0.3
  12. WordPress Core < 6.0.3 - Reflected Cross-Site Scripting via SQL Injection
    High · 8.8 CVE-2022-43497 <= 3.6.1, >= 3.7, <= 3.7.39, >= 3.8, <= 3.8.39, >= 3.9, <= 3.9.37, >= 4.0, <= 4.0.36, >= 4.1, <= 4.1.36, >= 4.2, <= 4.2.33, >= 4.3, <= 4.3.29, >= 4.4, <= 4.4.28, >= 4.5, <= 4.5.27, >= 4.6, <= 4.6.24, >= 4.7, <= 4.7.24, >= 4.8, <= 4.8.20, >= 4.9, <= 4.9.21, >= 5.0, <= 5.0.17, >= 5.1, <= 5.1.14, >= 5.2, <= 5.2.16, >= 5.3, <= 5.3.13, >= 5.4, <= 5.4.11, >= 5.5, <= 5.5.10, >= 5.6, <= 5.6.9, >= 5.7, <= 5.7.7, >= 5.8, <= 5.8.5, >= 5.9, <= 5.9.4, >= 6.0, <= 6.0.2 3.7.40, 3.8.40, 3.9.38, 4.0.37, 4.1.37, 4.2.34, 4.3.30, 4.4.29, 4.5.28, 4.6.25, 4.7.25, 4.8.21, 4.9.22, 5.0.18, 5.1.15, 5.2.17, 5.3.14, 5.4.12, 5.5.11, 5.6.10, 5.7.8, 5.8.6, 5.9.5, 6.0.3
  13. WordPress Core < 6.0.2 - Authenticated SQL Injection
    High · 8.0 0248f829-84de-40b9-bb63-354fbf06472d <= 3.6.1, >= 3.7, <= 3.7.38, >= 3.8, <= 3.8.38, >= 3.9, <= 3.9.36, >= 4.0, <= 4.0.35, >= 4.1, <= 4.1.35, >= 4.2, <= 4.2.32, >= 4.3, <= 4.3.28, >= 4.4, <= 4.4.27, >= 4.5, <= 4.5.26, >= 4.6, <= 4.6.23, >= 4.7, <= 4.7.23, >= 4.8, <= 4.8.19, >= 4.9, <= 4.9.20, >= 5.0, <= 5.0.16, >= 5.1, <= 5.1.13, >= 5.2, <= 5.2.15, >= 5.3, <= 5.3.12, >= 5.4, <= 5.4.10, >= 5.5, <= 5.5.9, >= 5.6, <= 5.6.8, >= 5.7, <= 5.7.6, >= 5.8, <= 5.8.4, >= 5.9, <= 5.9.3, >= 6.0, <= 6.0.1 3.7.39, 3.8.39, 3.9.37, 4.0.36, 4.1.36, 4.2.33, 4.3.29, 4.4.28, 4.5.27, 4.6.24, 4.7.24, 4.8.20, 4.9.21, 5.0.17, 5.1.14, 5.2.16, 5.3.13, 5.4.11, 5.5.10, 5.6.9, 5.7.7, 5.8.5, 5.9.4, 6.0.2
  14. WordPress Core < 5.9.1 - jQuery Prototype Pollution
    High · 8.8 CVE-2021-20083 < 3.7, >= 3.7, <= 3.7.37, >= 3.8, <= 3.8.37, >= 3.9, <= 3.9.35, >= 4.0, <= 4.0.34, >= 4.1, <= 4.1.34, >= 4.2, <= 4.2.31, >= 4.3, <= 4.3.27, >= 4.4, <= 4.4.26, >= 4.5, <= 4.5.25, >= 4.6, <= 4.6.22, >= 4.7, <= 4.7.22, >= 4.8, <= 4.8.18, >= 4.9, <= 4.9.19, >= 5.0, <= 5.0.15, >= 5.1, <= 5.1.12, >= 5.2, <= 5.2.14, >= 5.3, <= 5.3.11, >= 5.4, <= 5.4.9, >= 5.5, <= 5.5.8, >= 5.6, <= 5.6.7, >= 5.7, <= 5.7.5, >= 5.8, <= 5.8.3, >= 5.9, <= 5.9.1 3.7.38, 3.8.38, 3.9.36, 4.0.35, 4.1.35, 4.2.32, 4.3.28, 4.4.27, 4.5.26, 4.6.23, 4.7.23, 4.8.19, 4.9.20, 5.0.16, 5.1.13, 5.2.15, 5.3.12, 5.4.10, 5.5.9, 5.6.8, 5.7.6, 5.8.4, 5.9.2
  15. WordPress Core < 5.8.3 - Authenticated (Author+) Stored Cross Site Scripting
    High · 8.0 CVE-2022-21662 >= 3.7, < 3.7.37, >= 3.8, < 3.8.37, >= 3.9, < 3.9.35, >= 4.0, < 4.0.34, >= 4.1, < 4.1.34, >= 4.2, < 4.2.31, >= 4.3, < 4.3.27, >= 4.4, < 4.4.26, >= 4.5, < 4.5.25, >= 4.6, < 4.6.22, >= 4.7, < 4.7.22, >= 4.8, < 4.8.18, >= 4.9, < 4.9.19, >= 5.0, < 5.0.15, >= 5.1, < 5.1.12, >= 5.2, < 5.2.14, >= 5.3, < 5.3.11, >= 5.4, < 5.4.9, >= 5.5, < 5.5.8, >= 5.6, < 5.6.7, >= 5.7, < 5.7.5, >= 5.8, < 5.8.3 3.7.37, 3.8.37, 3.9.35, 4.0.34, 4.1.34, 4.2.31, 4.3.27, 4.4.26, 4.5.25, 4.6.22, 4.7.22, 4.8.18, 4.9.19, 5.0.15, 5.1.12, 5.2.14, 5.3.11, 5.4.9, 5.5.8, 5.6.7, 5.7.5, 5.8.3
  16. WordPress Core < 5.8.3 - SQL Injection via WP_Meta_Query
    High · 7.4 CVE-2022-21664 >= 4.1, < 4.1.34, >= 4.2, < 4.2.31, >= 4.3, < 4.3.27, >= 4.4, < 4.4.26, >= 4.5, < 4.5.25, >= 4.6, < 4.6.22, >= 4.7, < 4.7.22, >= 4.8, < 4.8.18, >= 4.9, < 4.9.19, >= 5.0, < 5.0.15, >= 5.1, < 5.1.12, >= 5.2, < 5.2.14, >= 5.3, < 5.3.11, >= 5.4, < 5.4.9, >= 5.5, < 5.5.8, >= 5.6, < 5.6.7, >= 5.7, < 5.7.5, >= 5.8, < 5.8.3 4.1.34, 4.2.31, 4.3.27, 4.4.26, 4.5.25, 4.6.22, 4.7.22, 4.8.18, 4.9.19, 5.0.15, 5.1.12, 5.2.14, 5.3.11, 5.4.9, 5.5.8, 5.6.7, 5.7.5, 5.8.3
  17. WordPress Core 5.4 - 5.8 - Authenticated Stored Cross-Site Scripting
    High · 7.6 CVE-2021-39201 >= 5.4, < 5.4.7, >= 5.5, < 5.5.6, >= 5.6, < 5.6.5, >= 5.7, < 5.7.3, >= 5.8, < 5.8.1 5.4.7, 5.5.6, 5.6.5, 5.7.3, 5.8.1
  18. WordPress Core < 5.7.1 - XXE Injection
    High · 7.1 CVE-2021-29447 >= 4.7, < 4.7.20, >= 4.8, < 4.8.16, >= 4.9, < 4.9.17, >= 5.0, < 5.0.12, >= 5.1, < 5.1.9, >= 5.2, < 5.2.10, >= 5.3, < 5.3.7, >= 5.4, < 5.4.5, >= 5.5, < 5.5.4, >= 5.6, < 5.6.3, >= 5.7, < 5.7.1 4.7.20, 4.8.16, 4.9.17, 5.0.12, 5.1.9, 5.2.10, 5.3.7, 5.4.5, 5.5.4, 5.6.3, 5.7.1
  19. WordPress Core < 5.8.3 - SQL Injection via WP_Query
    High · 8.0 CVE-2022-21661 >= 3.7, < 3.7.37, >= 3.8, < 3.8.37, >= 3.9, < 3.9.35, >= 4.0, < 4.0.34, >= 4.1, < 4.1.34, >= 4.2, < 4.2.31, >= 4.3, < 4.3.27, >= 4.4, < 4.4.26, >= 4.5, < 4.5.25, >= 4.6, < 4.6.22, >= 4.7, < 4.7.22, >= 4.8, < 4.8.18, >= 4.9, < 4.9.19, >= 5.0, < 5.0.15, >= 5.1, < 5.1.12, >= 5.2, < 5.2.14, >= 5.3, < 5.3.11, >= 5.4, < 5.4.9, >= 5.5, < 5.5.8, >= 5.6, < 5.6.7, >= 5.7, < 5.7.5, >= 5.8, < 5.8.3 3.7.37, 3.8.37, 3.9.35, 4.0.34, 4.1.34, 4.2.31, 4.3.27, 4.4.26, 4.5.25, 4.6.22, 4.7.22, 4.8.18, 4.9.19, 5.0.15, 5.1.12, 5.2.14, 5.3.11, 5.4.9, 5.5.8, 5.6.7, 5.7.5, 5.8.3
  20. WordPress Core < 5.5.2 - Privilege Escalation via XML-RPC
    High · 8.8 CVE-2020-28035 < 3.7, >= 3.7, <= 3.7.34, >= 3.8, <= 3.8.34, >= 3.9, <= 3.9.32, >= 4.0, <= 4.0.31, >= 4.1, <= 4.1.31, >= 4.2, <= 4.2.28, >= 4.3, <= 4.3.24, >= 4.4, <= 4.4.23, >= 4.5, <= 4.5.22, >= 4.6, <= 4.6.19, >= 4.7, <= 4.7.18, >= 4.8, <= 4.8.14, >= 4.9, <= 4.9.15, >= 5.0, <= 5.0.10, >= 5.1, <= 5.1.6, >= 5.2, <= 5.2.7, >= 5.3, <= 5.3.4, >= 5.4, <= 5.4.2, >= 5.5, <= 5.5.1 3.7.35, 3.8.35, 3.9.33, 4.0.32, 4.1.32, 4.2.29, 4.3.25, 4.4.24, 4.5.23, 4.6.20, 4.7.19, 4.8.15, 4.9.16, 5.0.11, 5.1.7, 5.2.8, 5.3.5, 5.4.3, 5.5.2
  21. WordPress Core < 5.5.2 - Deserialization Gadget
    High · 8.8 CVE-2020-28032 < 3.7, >= 3.7, <= 3.7.34, >= 3.8, <= 3.8.34, >= 3.9, <= 3.9.32, >= 4.0, <= 4.0.31, >= 4.1, <= 4.1.31, >= 4.2, <= 4.2.28, >= 4.3, <= 4.3.24, >= 4.4, <= 4.4.23, >= 4.5, <= 4.5.22, >= 4.6, <= 4.6.19, >= 4.7, <= 4.7.18, >= 4.8, <= 4.8.14, >= 4.9, <= 4.9.15, >= 5.0, <= 5.0.10, >= 5.1, <= 5.1.6, >= 5.2, <= 5.2.7, >= 5.3, <= 5.3.4, >= 5.4, <= 5.4.2, >= 5.5, <= 5.5.1 3.7.35, 3.8.35, 3.9.33, 4.0.32, 4.1.32, 4.2.29, 4.3.25, 4.4.24, 4.5.23, 4.6.20, 4.7.19, 4.8.15, 4.9.16, 5.0.11, 5.1.7, 5.2.8, 5.3.5, 5.4.3, 5.5.2
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