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Vulnerability details: VCID-9pdw-udwq-6kbz
Vulnerability ID VCID-9pdw-udwq-6kbz
Aliases CVE-2025-9820
GNUTLS-SA-2025-11-18
Summary gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function
Status Published
Exploitability 0.5
Weighted Severity 3.6
Risk 1.8
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-121 Stack-based Buffer Overflow
System Score Found at
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:3477
ssvc Track https://access.redhat.com/errata/RHSA-2026:3477
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:4188
ssvc Track https://access.redhat.com/errata/RHSA-2026:4188
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:4655
ssvc Track https://access.redhat.com/errata/RHSA-2026:4655
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:4943
ssvc Track https://access.redhat.com/errata/RHSA-2026:4943
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:5585
ssvc Track https://access.redhat.com/errata/RHSA-2026:5585
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:5606
ssvc Track https://access.redhat.com/errata/RHSA-2026:5606
cvssv3.1 4 https://access.redhat.com/errata/RHSA-2026:7329
ssvc Track https://access.redhat.com/errata/RHSA-2026:7329
cvssv3 4.0 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-9820.json
cvssv3.1 4 https://access.redhat.com/security/cve/CVE-2025-9820
ssvc Track https://access.redhat.com/security/cve/CVE-2025-9820
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
epss 0.00015 https://api.first.org/data/v1/epss?cve=CVE-2025-9820
cvssv3.1 4 https://bugzilla.redhat.com/show_bug.cgi?id=2392528
ssvc Track https://bugzilla.redhat.com/show_bug.cgi?id=2392528
cvssv3.1 4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 4 https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
ssvc Track https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
cvssv3.1 4 https://gitlab.com/gnutls/gnutls/-/issues/1732
ssvc Track https://gitlab.com/gnutls/gnutls/-/issues/1732
cvssv3.1 4 https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
ssvc Track https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-9820.json
https://api.first.org/data/v1/epss?cve=CVE-2025-9820
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-9820
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1121146 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1121146
1732 https://gitlab.com/gnutls/gnutls/-/issues/1732
1d56f96f6ab5034d677136b9d50b5a75dff0faf5 https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
2392528 https://bugzilla.redhat.com/show_bug.cgi?id=2392528
cpe:/a:redhat:ceph_storage:8::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:ceph_storage:8::el9
cpe:/a:redhat:discovery:2::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:discovery:2::el9
cpe:/a:redhat:enterprise_linux:8::appstream https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:9::appstream https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:hummingbird:1 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:insights_proxy:1.5::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:insights_proxy:1.5::el9
cpe:/a:redhat:openshift:4 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:openshift:4
cpe:/a:redhat:rhui:5::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:rhui:5::el9
cpe:/o:redhat:enterprise_linux:10.1 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:10.1
cpe:/o:redhat:enterprise_linux:6 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8::baseos https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:8::baseos
cpe:/o:redhat:enterprise_linux:9::baseos https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:9::baseos
CVE-2025-9820 https://access.redhat.com/security/cve/CVE-2025-9820
RHSA-2026:3477 https://access.redhat.com/errata/RHSA-2026:3477
RHSA-2026:4188 https://access.redhat.com/errata/RHSA-2026:4188
RHSA-2026:4655 https://access.redhat.com/errata/RHSA-2026:4655
RHSA-2026:4943 https://access.redhat.com/errata/RHSA-2026:4943
RHSA-2026:5585 https://access.redhat.com/errata/RHSA-2026:5585
RHSA-2026:5606 https://access.redhat.com/errata/RHSA-2026:5606
RHSA-2026:7329 https://access.redhat.com/errata/RHSA-2026:7329
security-new.html#GNUTLS-SA-2025-11-18 https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
USN-8043-1 https://usn.ubuntu.com/8043-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:3477
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

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:3477
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:4188
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

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:4188
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:4655
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

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unchanged

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:4655
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:4943
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

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required

unchanged

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:4943
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:5585
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

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none

required

unchanged

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:5585
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:5606
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

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required

unchanged

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:5606
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/errata/RHSA-2026:7329
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

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/errata/RHSA-2026:7329
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-9820.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

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required

unchanged

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Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/security/cve/CVE-2025-9820
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

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none

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required

unchanged

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://access.redhat.com/security/cve/CVE-2025-9820
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://bugzilla.redhat.com/show_bug.cgi?id=2392528
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

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required

unchanged

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none

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://bugzilla.redhat.com/show_bug.cgi?id=2392528
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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

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required

unchanged

changed

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none

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low

none

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none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://gitlab.com/gnutls/gnutls/-/issues/1732
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://gitlab.com/gnutls/gnutls/-/issues/1732
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:10:45Z/ Found at https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
Exploit Prediction Scoring System (EPSS)
Percentile 0.02569
EPSS Score 0.00014
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:34:57.013907+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-9820.json 38.0.0