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Vulnerability details: VCID-9u53-b79b-cfgd
Vulnerability ID VCID-9u53-b79b-cfgd
Aliases CVE-2021-34798
Summary Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-476 NULL Pointer Dereference
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-34798.json
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
epss 0.1029 https://api.first.org/data/v1/epss?cve=CVE-2021-34798
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd moderate https://httpd.apache.org/security/json/CVE-2021-34798.json
archlinux High https://security.archlinux.org/AVG-2289
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-34798.json
https://api.first.org/data/v1/epss?cve=CVE-2021-34798
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34798
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36160
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39275
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40438
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2005128 https://bugzilla.redhat.com/show_bug.cgi?id=2005128
AVG-2289 https://security.archlinux.org/AVG-2289
CVE-2021-34798 https://httpd.apache.org/security/json/CVE-2021-34798.json
GLSA-202208-20 https://security.gentoo.org/glsa/202208-20
RHSA-2021:4613 https://access.redhat.com/errata/RHSA-2021:4613
RHSA-2021:4614 https://access.redhat.com/errata/RHSA-2021:4614
RHSA-2022:0143 https://access.redhat.com/errata/RHSA-2022:0143
RHSA-2022:0891 https://access.redhat.com/errata/RHSA-2022:0891
RHSA-2022:6753 https://access.redhat.com/errata/RHSA-2022:6753
USN-5090-1 https://usn.ubuntu.com/5090-1/
USN-5090-2 https://usn.ubuntu.com/5090-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-34798.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.93141
EPSS Score 0.1029
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:23.138548+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2021-34798.json 38.0.0