Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-73r3-6fbf-kqcu
Vulnerability ID VCID-73r3-6fbf-kqcu
Aliases CVE-2026-40021
GHSA-4f7c-pmjv-c25w
Summary
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-116 Improper Encoding or Escaping of Output
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00285 https://api.first.org/data/v1/epss?cve=CVE-2026-40021
epss 0.00285 https://api.first.org/data/v1/epss?cve=CVE-2026-40021
epss 0.00285 https://api.first.org/data/v1/epss?cve=CVE-2026-40021
epss 0.00285 https://api.first.org/data/v1/epss?cve=CVE-2026-40021
cvssv3.1 3.7 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-4f7c-pmjv-c25w
cvssv3.1 5.3 https://github.com/apache/logging-log4net
cvssv4 6.3 https://github.com/apache/logging-log4net
generic_textual MODERATE https://github.com/apache/logging-log4net
cvssv3.1 5.3 https://github.com/apache/logging-log4net/pull/280
cvssv4 6.3 https://github.com/apache/logging-log4net/pull/280
generic_textual MODERATE https://github.com/apache/logging-log4net/pull/280
ssvc Track https://github.com/apache/logging-log4net/pull/280
cvssv3.1 5.3 https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
cvssv4 6.3 https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
generic_textual MODERATE https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
ssvc Track https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
cvssv3.1 5.3 https://logging.apache.org/cyclonedx/vdr.xml
cvssv4 6.3 https://logging.apache.org/cyclonedx/vdr.xml
generic_textual MODERATE https://logging.apache.org/cyclonedx/vdr.xml
ssvc Track https://logging.apache.org/cyclonedx/vdr.xml
cvssv3.1 5.3 https://logging.apache.org/log4net/manual/configuration/layouts.html
cvssv4 6.3 https://logging.apache.org/log4net/manual/configuration/layouts.html
generic_textual MODERATE https://logging.apache.org/log4net/manual/configuration/layouts.html
ssvc Track https://logging.apache.org/log4net/manual/configuration/layouts.html
cvssv3.1 5.3 https://logging.apache.org/security.html#CVE-2026-40021
cvssv4 6.3 https://logging.apache.org/security.html#CVE-2026-40021
generic_textual MODERATE https://logging.apache.org/security.html#CVE-2026-40021
ssvc Track https://logging.apache.org/security.html#CVE-2026-40021
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-40021
cvssv4 6.3 https://nvd.nist.gov/vuln/detail/CVE-2026-40021
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-40021
cvssv3.1 5.3 http://www.openwall.com/lists/oss-security/2026/04/10/11
cvssv4 6.3 http://www.openwall.com/lists/oss-security/2026/04/10/11
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2026/04/10/11
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-40021
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40021
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/apache/logging-log4net
https://nvd.nist.gov/vuln/detail/CVE-2026-40021
http://www.openwall.com/lists/oss-security/2026/04/10/11
1133360 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1133360
280 https://github.com/apache/logging-log4net/pull/280
cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*
GHSA-4f7c-pmjv-c25w https://github.com/advisories/GHSA-4f7c-pmjv-c25w
layouts.html https://logging.apache.org/log4net/manual/configuration/layouts.html
q8otftjswhk69n3kxslqg7cobr0x4st7 https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
security.html#CVE-2026-40021 https://logging.apache.org/security.html#CVE-2026-40021
vdr.xml https://logging.apache.org/cyclonedx/vdr.xml
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N 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
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/apache/logging-log4net
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://github.com/apache/logging-log4net
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

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:L/A:N Found at https://github.com/apache/logging-log4net/pull/280
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://github.com/apache/logging-log4net/pull/280
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T17:32:06Z/ Found at https://github.com/apache/logging-log4net/pull/280
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T17:32:06Z/ Found at https://lists.apache.org/thread/q8otftjswhk69n3kxslqg7cobr0x4st7
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://logging.apache.org/cyclonedx/vdr.xml
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://logging.apache.org/cyclonedx/vdr.xml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T17:32:06Z/ Found at https://logging.apache.org/cyclonedx/vdr.xml
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://logging.apache.org/log4net/manual/configuration/layouts.html
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://logging.apache.org/log4net/manual/configuration/layouts.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T17:32:06Z/ Found at https://logging.apache.org/log4net/manual/configuration/layouts.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://logging.apache.org/security.html#CVE-2026-40021
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://logging.apache.org/security.html#CVE-2026-40021
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T17:32:06Z/ Found at https://logging.apache.org/security.html#CVE-2026-40021
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-40021
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-40021
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

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:L/A:N Found at http://www.openwall.com/lists/oss-security/2026/04/10/11
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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N Found at http://www.openwall.com/lists/oss-security/2026/04/10/11
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.52347
EPSS Score 0.00285
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-10T18:14:25.042249+00:00 SUSE Severity Score Importer Import https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml 38.6.0