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Vulnerability details: VCID-wrw6-uzz4-rkfb
Vulnerability ID VCID-wrw6-uzz4-rkfb
Aliases CVE-2021-39275
Summary ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. 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-787 Out-of-bounds Write
System Score Found at
cvssv3 8.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39275.json
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
epss 0.37674 https://api.first.org/data/v1/epss?cve=CVE-2021-39275
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd low https://httpd.apache.org/security/json/CVE-2021-39275.json
archlinux High https://security.archlinux.org/AVG-2289
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39275.json
https://api.first.org/data/v1/epss?cve=CVE-2021-39275
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
2005119 https://bugzilla.redhat.com/show_bug.cgi?id=2005119
AVG-2289 https://security.archlinux.org/AVG-2289
CVE-2021-39275 https://httpd.apache.org/security/json/CVE-2021-39275.json
GLSA-202208-20 https://security.gentoo.org/glsa/202208-20
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
RHSA-2022:7143 https://access.redhat.com/errata/RHSA-2022:7143
RHSA-2022:7144 https://access.redhat.com/errata/RHSA-2022:7144
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:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39275.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 0.97171
EPSS Score 0.37674
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:23.170891+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2021-39275.json 38.0.0