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Vulnerability details: VCID-y6fg-pbc5-4udu
Vulnerability ID VCID-y6fg-pbc5-4udu
Aliases CVE-2022-23635
GHSA-856q-xv3c-7f2f
Summary Unauthenticated control plane denial of service attack in Istio ### Impact The Istio control plane, `istiod`, is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing. This endpoint is served over TLS port 15012, but does not require any authentication from the attacker. For simple installations, Istiod is typically only reachable from within the cluster, limiting the blast radius. However, for some deployments, especially [multicluster](https://istio.io/latest/docs/setup/install/multicluster/primary-remote/) topologies, this port is exposed over the public internet. ### Patches - Istio 1.13.1 and above - Istio 1.12.4 and above - Istio 1.11.7 and above ### Workarounds There are no effective workarounds, beyond upgrading. Limiting network access to Istiod to the minimal set of clients can help lessen the scope of the vulnerability to some extent. ### References More details can be found in the [Istio Security Bulletin](https://istio.io/latest/news/security/istio-security-2022-003) ### For more information If you have any questions or comments about this advisory, please email us at [istio-security-vulnerability-reports@googlegroups.com](mailto:istio-security-vulnerability-reports@googlegroups.com)
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-1284 Improper Validation of Specified Quantity in Input
CWE-287 Improper Authentication
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-23635.json
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00648 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
epss 0.00684 https://api.first.org/data/v1/epss?cve=CVE-2022-23635
cvssv3.1 7.5 https://github.com/istio/istio
generic_textual HIGH https://github.com/istio/istio
cvssv3.1 7.5 https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
generic_textual HIGH https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
ssvc Track https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
cvssv3.1 7.5 https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
generic_textual HIGH https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
ssvc Track https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
cvssv3.1 7.5 https://istio.io/latest/news/security/istio-security-2022-003
generic_textual HIGH https://istio.io/latest/news/security/istio-security-2022-003
ssvc Track https://istio.io/latest/news/security/istio-security-2022-003
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2022-23635
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2022-23635
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2022-23635
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-23635.json
https://api.first.org/data/v1/epss?cve=CVE-2022-23635
https://github.com/istio/istio
https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
https://istio.io/latest/news/security/istio-security-2022-003
https://nvd.nist.gov/vuln/detail/CVE-2022-23635
2057277 https://bugzilla.redhat.com/show_bug.cgi?id=2057277
cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
RHSA-2022:1275 https://access.redhat.com/errata/RHSA-2022:1275
RHSA-2022:1276 https://access.redhat.com/errata/RHSA-2022:1276
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-23635.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://github.com/istio/istio
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://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
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:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:57:30Z/ Found at https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
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:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:57:30Z/ Found at https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://istio.io/latest/news/security/istio-security-2022-003
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:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:57:30Z/ Found at https://istio.io/latest/news/security/istio-security-2022-003
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2022-23635
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:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2022-23635
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 0.69863
EPSS Score 0.00648
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:02:21.558657+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-856q-xv3c-7f2f/GHSA-856q-xv3c-7f2f.json 37.0.0