How severe is CVE-2023-33189?

CVE-2023-33189 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-33189 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33189?

CVE-2023-33189 primarily affects Pomerium. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-33189?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-33189 published?

CVE-2023-33189 was published on 2023-05-30 and last updated on 2026-06-17.

CVE-2023-33189

CVE-2023-33189 is a critical-severity vulnerability in Pomerium with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Pomerium
Published: 2023-05-30
Last modified: 2026-06-17

Description

Pomerium is an identity and context-aware access proxy. With specially crafted requests, incorrect authorization decisions may be made by Pomerium. This issue has been patched in versions 0.17.4, 0.18.1, 0.19.2, 0.20.1, 0.21.4 and 0.22.2.

Frequently asked questions

What is CVE-2023-33189?: Pomerium is an identity and context-aware access proxy. With specially crafted requests, incorrect authorization decisions may be made by Pomerium. This issue has been patched in versions 0.17.4, 0.18.1, 0.19.2, 0.20.1, 0.21.4 and 0.22.2.
How severe is CVE-2023-33189?: CVE-2023-33189 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-33189 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33189?: CVE-2023-33189 primarily affects Pomerium. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-33189?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-33189 published?: CVE-2023-33189 was published on 2023-05-30 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:pomerium:pomerium:*:*:*:*:*:*:*:*
cpe:2.3:a:pomerium:pomerium:0.18.0:*:*:*:*:*:*:*
cpe:2.3:a:pomerium:pomerium:0.20.0:*:*:*:*:*:*:*

More vulnerabilities in Pomerium

CVE-2021-39206 — High (CVSS 8.6): Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization…
CVE-2021-39162 — High (CVSS 8.6): Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if…
CVE-2021-39204 — High (CVSS 7.5): Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles…
CVE-2022-24797 — Medium (CVSS 6.5): Pomerium is an identity-aware access proxy. In distributed service mode, Pomerium's Authenticate service exposes pprof…
CVE-2021-29652 — Medium (CVSS 6.1): Pomerium from version 0.10.0-0.13.3 has an Open Redirect in the user sign-in/out process
CVE-2021-29651 — Medium (CVSS 6.1): Pomerium before 0.13.4 has an Open Redirect (issue 1 of 2).

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Other CWE-285 (Improper Authorization) vulnerabilities

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