Vulnerability Details : CVE-2021-26691
In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow
Vulnerability category: OverflowMemory Corruption
Products affected by CVE-2021-26691
- 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:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:secure_backup:*:*:*:*:*:*:*:*
- 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:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
Threat overview for CVE-2021-26691
Top countries where our scanners detected CVE-2021-26691
Top open port discovered on systems with this issue
80
IPs affected by CVE-2021-26691 9,089,483
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-26691!
*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-2021-26691
40.93%
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-2021-26691
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-26691
-
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().Assigned by: security@apache.org (Secondary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-26691
-
https://lists.apache.org/thread.html/r50cae1b71f1e7421069036b213c26da7d8f47dd59874e3bd956959fe@%3Cannounce.httpd.apache.org%3E
CVE-2021-26691: mod_session response handling heap overflow - Pony MailMailing List;Vendor Advisory
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http://www.openwall.com/lists/oss-security/2021/06/10/7
oss-security - CVE-2021-26691: Apache httpd: mod_session response handling heap overflowMailing List;Third Party Advisory
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https://www.debian.org/security/2021/dsa-4937
Debian -- Security Information -- DSA-4937-1 apache2Mailing List;Third Party Advisory
-
https://www.oracle.com/security-alerts/cpujan2022.html
Oracle Critical Patch Update Advisory - January 2022Patch;Third Party Advisory
-
https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd@%3Cdev.httpd.apache.org%3E
Pony Mail!Mailing List;Vendor Advisory
-
https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E
svn commit: r48071 - in /release/httpd: Announcement2.4.html Announcement2.4.txt CHANGES_2.4 CHANGES_2.4.48 CURRENT-IS-2.4.46 CURRENT-IS-2.4.48 - Pony MailMailing List;Release Notes;Vendor Advisory
-
https://security.gentoo.org/glsa/202107-38
Apache: Multiple vulnerabilities (GLSA 202107-38) — Gentoo securityThird Party Advisory
-
https://www.oracle.com/security-alerts/cpuoct2021.html
Oracle Critical Patch Update Advisory - October 2021Patch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html
[SECURITY] [DLA 2706-1] apache2 security updateMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
[SECURITY] Fedora 35 Update: httpd-2.4.49-1.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210702-0001/
June 2021 Apache HTTP Server Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
http://httpd.apache.org/security/vulnerabilities_24.html
httpd 2.4 vulnerabilities - The Apache HTTP Server ProjectVendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
[SECURITY] Fedora 34 Update: httpd-2.4.49-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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