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Vulnerability details: VCID-113c-txjs-17d6
Vulnerability ID VCID-113c-txjs-17d6
Aliases CVE-2020-16844
GHSA-82mm-ffjr-h86c
Summary Authorization bypass in Istio In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy. ### Specific Go Packages Affected istio.io/istio/pilot/pkg/security/authz/model/matcher
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-284 Improper Access Control
System Score Found at
cvssv3 6.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-16844.json
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-16844
cvssv3.1 6.8 https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c
generic_textual MODERATE https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c
cvssv3.1 6.8 https://github.com/istio/istio/commit/72d2e135374f421b656d6f1a21f474db46134ace
generic_textual MODERATE https://github.com/istio/istio/commit/72d2e135374f421b656d6f1a21f474db46134ace
cvssv3.1 6.8 https://github.com/istio/istio/releases
generic_textual MODERATE https://github.com/istio/istio/releases
cvssv3.1 6.8 https://github.com/istio/istio/releases/tag/1.5.9
generic_textual MODERATE https://github.com/istio/istio/releases/tag/1.5.9
cvssv3.1 6.8 https://github.com/istio/istio/releases/tag/1.6.8
generic_textual MODERATE https://github.com/istio/istio/releases/tag/1.6.8
cvssv3.1 6.8 https://istio.io/latest/news/releases/1.5.x/announcing-1.5.9
generic_textual MODERATE https://istio.io/latest/news/releases/1.5.x/announcing-1.5.9
cvssv3.1 6.8 https://istio.io/latest/news/releases/1.6.x/announcing-1.6.8
generic_textual MODERATE https://istio.io/latest/news/releases/1.6.x/announcing-1.6.8
cvssv3.1 6.8 https://istio.io/latest/news/security/istio-security-2020-009
generic_textual MODERATE https://istio.io/latest/news/security/istio-security-2020-009
cvssv3.1 6.8 https://nvd.nist.gov/vuln/detail/CVE-2020-16844
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-16844
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-16844.json
https://api.first.org/data/v1/epss?cve=CVE-2020-16844
https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c
https://github.com/istio/istio/commit/72d2e135374f421b656d6f1a21f474db46134ace
https://github.com/istio/istio/releases
https://github.com/istio/istio/releases/tag/1.5.9
https://github.com/istio/istio/releases/tag/1.6.8
https://istio.io/latest/news/releases/1.5.x/announcing-1.5.9
https://istio.io/latest/news/releases/1.6.x/announcing-1.6.8
https://istio.io/latest/news/security/istio-security-2020-009
https://nvd.nist.gov/vuln/detail/CVE-2020-16844
1861625 https://bugzilla.redhat.com/show_bug.cgi?id=1861625
RHSA-2020:3425 https://access.redhat.com/errata/RHSA-2020:3425
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-16844.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

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low

none

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none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c
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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none

required

unchanged

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none

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none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/commit/72d2e135374f421b656d6f1a21f474db46134ace
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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none

required

unchanged

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Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/releases
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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high

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none

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low

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none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/releases/tag/1.5.9
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

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Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/releases/tag/1.6.8
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

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none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://istio.io/latest/news/releases/1.5.x/announcing-1.5.9
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:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://istio.io/latest/news/releases/1.6.x/announcing-1.6.8
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:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://istio.io/latest/news/security/istio-security-2020-009
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

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Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-16844
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

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none

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.51689
EPSS Score 0.00284
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:06:22.955040+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-82mm-ffjr-h86c/GHSA-82mm-ffjr-h86c.json 38.0.0