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Vulnerability details: VCID-tkkj-f8ww-1kdn
Vulnerability ID VCID-tkkj-f8ww-1kdn
Aliases CVE-2020-12403
Summary A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.
Status Published
Exploitability 0.5
Weighted Severity 8.2
Risk 4.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12403.json
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2020-12403
cvssv2 6.4 https://nvd.nist.gov/vuln/detail/CVE-2020-12403
cvssv3.1 9.1 https://nvd.nist.gov/vuln/detail/CVE-2020-12403
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12403.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12403
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12403
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes
https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html
https://security.netapp.com/advisory/ntap-20230324-0006/
1868931 https://bugzilla.redhat.com/show_bug.cgi?id=1868931
cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:*
CVE-2020-12403 https://nvd.nist.gov/vuln/detail/CVE-2020-12403
RHSA-2020:4076 https://access.redhat.com/errata/RHSA-2020:4076
RHSA-2021:0538 https://access.redhat.com/errata/RHSA-2021:0538
RHSA-2021:0758 https://access.redhat.com/errata/RHSA-2021:0758
RHSA-2021:0876 https://access.redhat.com/errata/RHSA-2021:0876
RHSA-2021:0949 https://access.redhat.com/errata/RHSA-2021:0949
RHSA-2021:1026 https://access.redhat.com/errata/RHSA-2021:1026
USN-4476-1 https://usn.ubuntu.com/4476-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12403.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: AV:N/AC:L/Au:N/C:P/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12403
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12403
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 0.41426
EPSS Score 0.00191
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:22.919252+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.12/main.json 37.0.0