CVE-2021-41524

Published on: 10/05/2021 12:00:00 AM UTC

Last Modified on: 03/25/2022 06:24:00 PM UTC

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

Certain versions of Http Server from Apache contain the following vulnerability:

While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.

  • CVE-2021-41524 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Apache Software Foundation - Apache HTTP Server version = 2.4.49
Vulnerability Patch/Work Around
  • Disable the HTTP/2 protocol.

CVSS3 Score: 7.5 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 5 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE NONE PARTIAL

CVE References

Description Tags Link
[SECURITY] Fedora 35 Update: httpd-2.4.50-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-f94985afca
Apache HTTP Server Vulnerabilties: October 2021 tools.cisco.com
text/html
URL Logo CISCO 20211007 Apache HTTP Server Vulnerabilties: October 2021
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20211005 [[email protected]] CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing
October 2021 Apache HTTP Server Vulnerabilities in NetApp Products | NetApp Product Security security.netapp.com
text/html
URL Logo CONFIRM security.netapp.com/advisory/ntap-20211029-0009/
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [announce] 20211005 CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing
oss-security - CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing www.openwall.com
text/html
URL Logo MLIST [oss-security] 20211005 CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing
Oracle Critical Patch Update Advisory - January 2022 www.oracle.com
text/html
URL Logo MISC www.oracle.com/security-alerts/cpujan2022.html
Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project httpd.apache.org
text/html
URL Logo MISC httpd.apache.org/security/vulnerabilities_24.html
No Description Provided lists.fedoraproject.org

Inactive LinkNot Archived
URL Logo FEDORA FEDORA-2021-5d2d4b6ac5

Related QID Numbers

  • 150403 Apache HTTP Server NULL pointer dereference (CVE-2021-31618,CVE-2021-41524)
  • 150404 Apache HTTP Server NULL pointer dereference (CVE-2021-41524)
  • 281962 Fedora Security Update for httpd (FEDORA-2021-5d2d4b6ac5)
  • 352857 Amazon Linux Security Advisory for httpd24: ALAS-2021-1543
  • 352858 Amazon Linux Security Advisory for httpd: ALAS2-2021-1716
  • 500023 Alpine Linux Security Update for apache2
  • 690017 Free Berkeley Software Distribution (FreeBSD) Security Update for apache httpd (25b78bdd-25b8-11ec-a341-d4c9ef517024)
  • 87465 Apache Hypertext Transfer Protocol Server (HTTP Server) Path Traversal and Null Pointer Dereference Vulnerabilities
  • 900394 Common Base Linux Mariner (CBL-Mariner) Security Update for httpd (5961)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationApacheHttp Server2.4.49AllAllAll
Operating
System
FedoraprojectFedora34AllAllAll
Operating
System
FedoraprojectFedora35AllAllAll
ApplicationNetappCloud Backup-AllAllAll
ApplicationOracleInstantis Enterprisetrack17.1AllAllAll
ApplicationOracleInstantis Enterprisetrack17.2AllAllAll
ApplicationOracleInstantis Enterprisetrack17.3AllAllAll
  • cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*:
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*:
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*:
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*:

Discovery Credit

Apache httpd team would like to thank LI ZHI XIN from NSFocus Security Team for reporting this issue.

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-41524 : While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request… twitter.com/i/web/status/1… 2021-10-05 08:44:16
Twitter Icon @ToonSpin @iamamoose On the vulnerabilities page, the CVE-2021-41524 entry says "Affects <= 2.4.49" but just above it, it say… twitter.com/i/web/status/1… 2021-10-05 10:29:06
Twitter Icon @Sp1l @iamamoose Update anyway, the moderate security vuln CVE-2021-41524 that was fixed as well is relevant to earlier versions too! 2021-10-05 11:39:42
Twitter Icon @Bobe_bot CVE-2021-41524 (Latest articles about Ongoing threats) kkhacklabs.com/cve-2021-41524/ 2021-10-05 12:00:03
Twitter Icon @iamamoose @Sp1l CVE-2021-41524 was also only 2.4.49, but due to an error was listed as Affects <=2.4.49 for a short time on t… twitter.com/i/web/status/1… 2021-10-05 12:06:25
Twitter Icon @oss_security CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing: Posted by Stefan Eissing on Oct 05Sever… twitter.com/i/web/status/1… 2021-10-05 13:22:02
Twitter Icon @omokazuki SIOSセキュリティブログを更新しました。 Apacheの脆弱性情報(Important: CVE-2021-41773, Moderate: CVE-2021-41524) #sios_tech #security… twitter.com/i/web/status/1… 2021-10-05 18:43:00
Twitter Icon @CERTpy ⚠️ Vulnerabilidades críticas en Apache Server ? CVE-2021-41773 y CVE-2021-41524 afectan Apache HTTP Server en su v… twitter.com/i/web/status/1… 2021-10-05 18:51:07
Twitter Icon @omokazuki タイトルが不適切なため訂正しました。 Apache HTTP Serverの脆弱性情報(Important: CVE-2021-41773, Moderate: CVE-2021-41524) #sios_tech… twitter.com/i/web/status/1… 2021-10-05 22:54:54
Twitter Icon @deepwatch_sec [Vulnerability Report] deepwatch Threat Operations is tracking CVE-2021-41773 and CVE-2021-41524 regarding vulnerab… twitter.com/i/web/status/1… 2021-10-05 23:29:18
Twitter Icon @Mitsuki_Shirase HTTP/2リクエストの処理における、NULLポインタ参照の脆弱性 (CVE-2021-41524) については、まだ Under investigation access.redhat.com/security/cve/C… 2021-10-06 05:55:43
Twitter Icon @softek_jp Apache httpd の HTTP/2 の処理にサービスを妨害される問題 (CVE-2021-41524) [40154] sid.softek.jp/content/show/4… #SIDfm #脆弱性情報 2021-10-06 06:44:32
Twitter Icon @threatmeter CVE-2021-41524 While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request pr… twitter.com/i/web/status/1… 2021-10-06 07:09:59
Twitter Icon @tanrakukairo CVE-2021-41524はNULLポインタ参照でサービス落ちる可能性があるだけか。 2021-10-06 07:11:05
Twitter Icon @Mitsuki_Shirase HTTP/2リクエストの処理における、NULLポインタ参照の脆弱性 (CVE-2021-41524)、jbcs-httpd24-httpd 以外は影響ない模様。 access.redhat.com/security/cve/C… 2021-10-06 08:05:16
Twitter Icon @masart_3 素敵ブログ。 Apache HTTP Serverの脆弱性情報(Important: CVE-2021-41773, Moderate: CVE-2021-41524) (PoCつき) -… twitter.com/i/web/status/1… 2021-10-06 12:40:33
Twitter Icon @mqhopewell ❓ Does your business use Apache web server? ??️ Patch it ASAP. Vulns: CVE-2021-41524 and CVE-2021-41773. A quick… twitter.com/i/web/status/1… 2021-10-06 20:02:34
Twitter Icon @CyBournSecurity Your organization uses Apache? You need to read this! CVE-2021-41773 warns of Path Traversal CVE-2021-41524 warns… twitter.com/i/web/status/1… 2021-10-07 13:46:17
Twitter Icon @hsur Apache httpd の脆弱性に注意(CVE-2021-41524, CVE-2021-41773): Apache httpd に脆弱性が見つかり 2.4.50 がリリースされました(さらに修正版の 2... blog.cles.jp/item/12763?utm… 2021-10-10 06:52:12
Reddit Logo Icon /r/blueteamsec CVE-2021-41524: Path Traversal vulnerability in Apache 2.4.49. 2021-10-05 19:13:32
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