NVD / CVE Program· CNA GitHub_M

CVE-2022-24726: Unauthenticated control plane denial of service attack in Istio

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 75.6% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: kiali (Red Hat:service_mesh:2.0::el8) 0:v1.24.7.redhat1-1.el8; servicemesh (Red Hat:service_mesh:2.0::el8) 0:2.0.9-3.el8; servicemesh-istioctl (Red Hat:service_mesh:2.0::el8) 0:2.0.9-3.el8.

Low priority for now. Upgrade to kiali (Red Hat:service_mesh:2.0::el8) 0:v1.24.7.redhat1-1.el8; servicemesh (Red Hat:service_mesh:2.0::el8) 0:2.0.9-3.el8; servicemesh-istioctl (Red Hat:service_mesh:2.0::el8) 0:2.0.9-3.el8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Istio is an open platform to connect, manage, and secure microservices. In affected versions 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 when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, 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 [external istiod](https://istio.io/latest/docs/setup/install/external-controlplane/) topologies, this port is exposed over the public internet. This issue has been patched in versions 1.13.2, 1.12.5 and 1.11.8. Users are advised to upgrade. Users unable to upgrade should disable access to a validating webhook that is exposed to the public internet or restrict the set of IP addresses that can query it to a set of known, trusted entities.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Mar 10, 2022
Updated: Jun 17, 2026
EPSS: 1.5% · 75th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.5%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.5
CNA · GitHub_M: 7.5; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
istio	istio	cpe:2.3:a:istio:istio

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

istio istiobefore 1.11.8
istio istio1.12.0 and later · before 1.12.5
istio istio1.13.0 and later · before 1.13.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

istio istio
- < 1.11.8,, >= 1.12.0, < 1.12.5, >= 1.13.0, < 1.13.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Red Hat:service_mesh:2.0::el8	kiali	before 0:v1.24.7.redhat1-1.el8	0:v1.24.7.redhat1-1.el8
Red Hat:service_mesh:2.0::el8	servicemesh	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-istioctl	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-mixc	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-mixs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-pilot-agent	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-pilot-discovery	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.0::el8	servicemesh-prometheus	before 0:2.14.0-16.el8.1	0:2.14.0-16.el8.1
Red Hat:service_mesh:2.0::el8	servicemesh-proxy	before 0:2.0.9-3.el8	0:2.0.9-3.el8
Red Hat:service_mesh:2.1::el8	servicemesh	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-cni	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-pilot-agent	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-pilot-discovery	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-proxy	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-proxy-debuginfo	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-proxy-debugsource	before 0:2.1.2-4.el8	0:2.1.2-4.el8
Red Hat:service_mesh:2.1::el8	servicemesh-proxy-wasm	before 0:2.1.2-4.el8	0:2.1.2-4.el8

Same product

istio: all records

Other highest-scoring records for the same primary product.

CVE-2022-31045Ill-formed headers may lead to unexpected behavior in Istio
39Monitor
CVE-2022-21679Authorization Policy bypass in Istio
39Monitor
CVE-2021-31921Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected servi
39Monitor

Published before and after this one in the same product

← EarlierCVE-2022-21701Jan 19, 2022 · Privileged Escalation in Istio
35Monitor
← EarlierCVE-2022-23635Feb 22, 2022 · Unauthenticated control plane denial of service attack in Istio
30Monitor
Later →CVE-2022-39278Oct 13, 2022 · Istio vulnerable to denial of service attack due to Golang Regex Library
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
red hat:kiali	0:v1.24.7.redhat1-1.el8 · Red Hat:service_mesh:2.0::el8	Package registry (OSV)
red hat:servicemesh	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-cni	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-istioctl	0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8	Package registry (OSV)
red hat:servicemesh-mixc	0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8	Package registry (OSV)
red hat:servicemesh-mixs	0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8	Package registry (OSV)
red hat:servicemesh-pilot-agent	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-pilot-discovery	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-proxy	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-proxy-debuginfo	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-proxy-debugsource	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)
red hat:servicemesh-proxy-wasm	0:2.1.2-4.el8 · Red Hat:service_mesh:2.1::el8	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

istio/istiocommit 6ca5055

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/golang/go/issues/51112

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records