CVE-2023-32187: An Allocation of Resources Without Limits or Throttling vulnerability in SUSE k3s allows attackers with access

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2023-32187 is a high-severity flaw (CVSS 7.5) affecting k3s. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Allocation of Resources Without Limits or Throttling vulnerability in SUSE k3s allows attackers with access to K3s servers' apiserver/supervisor port (TCP 6443) cause denial of service. This issue affects k3s: from v1.24.0 before v1.24.17+k3s1, from v1.25.0 before v1.25.13+k3s1, from v1.26.0 before v1.26.8+k3s1, from sev1.27.0 before v1.27.5+k3s1, from v1.28.0 before v1.28.1+k3s1.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-09-18
Last modified	2026-06-17

Publisher (CNA): SUSE · Vendor: k3s

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-09-18 13:15 UTCPublished CVE record published
2026-06-17 05:58 UTCUpdated Record last modified

k3s k3s DOWNGRADE

Affected: >= 1.24.0 and < 1.24.17\+k3s1 · >= 1.25.0 and < 1.25.13\+k3s1 · >= 1.26.0 and < 1.26.8\+k3s1 · >= 1.27.0 and < 1.27.5\+k3s1 · >= 1.28.0 and < 1.28.1\+k3s1

Fixed in: 1.24.17\+k3s1, 1.25.13\+k3s1, 1.26.8\+k3s1, 1.27.5\+k3s1, 1.28.1\+k3s1

Safe to downgrade to: a release before 1.24.0

1. Check installed version

apt-cache policy k3s || rpm -q k3s || k3s --version

2. No fixed release: DOWNGRADE to a release before 1.24.0 (Debian / Ubuntu)

apt-cache madison k3s sudo apt install k3s=<VERSION_BEFORE_1.24.0> sudo apt-mark hold k3s

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list k3s sudo dnf downgrade k3s-<VERSION_BEFORE_1.24.0> sudo dnf versionlock add k3s

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-32187?

k3s: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-32187 being exploited?

CVE-2023-32187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-32187 affect?

CVE-2023-32187 affects k3s. Severity is high (CVSS 7.5). An Allocation of Resources Without Limits or Throttling vulnerability in SUSE k3s allows attackers with access to K3s servers' apiserver/supervisor port (TCP 6443) cause denial of service. This issue affects k3s: from v1.24.0 before v1.24.1

How urgent is CVE-2023-32187?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

References

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