Vulnerability Details : CVE-2021-31618
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
Vulnerability category: Memory CorruptionDenial of service
Products affected by CVE-2021-31618
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
- 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:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Threat overview for CVE-2021-31618
Top countries where our scanners detected CVE-2021-31618
Top open port discovered on systems with this issue
80
IPs affected by CVE-2021-31618 10,029
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-31618!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
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Exploit prediction scoring system (EPSS) score for CVE-2021-31618
22.64%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 97 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31618
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-31618
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by:
- nvd@nist.gov (Primary)
- security@apache.org (Secondary)
References for CVE-2021-31618
-
https://security.netapp.com/advisory/ntap-20210727-0008/
CVE-2021-31618 Apache HTTP Server Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E
svn commit: r1075782 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_24.html-Apache Mail Archives
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https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1@%3Ccvs.httpd.apache.org%3E
svn commit: r1075782 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_24.html - Pony MailMailing List;Vendor Advisory
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/
[SECURITY] Fedora 33 Update: mod_http2-1.15.19-1.fc33 - package-announce - Fedora Mailing-Lists
-
https://www.debian.org/security/2021/dsa-4937
Debian -- Security Information -- DSA-4937-1 apache2Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/
[SECURITY] Fedora 34 Update: mod_http2-1.15.19-1.fc34 - package-announce - Fedora Mailing-Lists
-
https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f@%3Ccvs.httpd.apache.org%3E
Pony Mail!Mailing List;Vendor Advisory
-
http://www.openwall.com/lists/oss-security/2021/06/10/9
oss-security - CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 requestMailing List;Third Party Advisory
-
https://seclists.org/oss-sec/2021/q2/206
oss-sec: CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 requestMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/
[SECURITY] Fedora 34 Update: mod_http2-1.15.19-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E
svn commit: r1890801 - /httpd/site/trunk/content/security/json/CVE-2021-31618.json-Apache Mail Archives
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https://security.gentoo.org/glsa/202107-38
Apache: Multiple vulnerabilities (GLSA 202107-38) — Gentoo securityThird Party Advisory
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https://www.oracle.com/security-alerts/cpuoct2021.html
Oracle Critical Patch Update Advisory - October 2021Patch;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html
[SECURITY] [DLA 2706-1] apache2 security updateMailing List;Third Party Advisory
-
http://httpd.apache.org/security/vulnerabilities_24.html
httpd 2.4 vulnerabilities - The Apache HTTP Server ProjectRelease Notes;Vendor Advisory
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http://www.openwall.com/lists/oss-security/2024/03/13/2
oss-security - Re: CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 request
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/
[SECURITY] Fedora 33 Update: mod_http2-1.15.19-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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