How severe is CVE-2022-33903?

CVE-2022-33903 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-33903 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-33903?

CVE-2022-33903 affects Torproject Tor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-33903?

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

When was CVE-2022-33903 published?

CVE-2022-33903 was published on 2022-07-17 and last updated on 2026-06-17.

CVE-2022-33903

CVE-2022-33903 is a high-severity vulnerability in Torproject Tor with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Torproject Tor
Published: 2022-07-17
Last modified: 2026-06-17

Description

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Frequently asked questions

What is CVE-2022-33903?: Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.
How severe is CVE-2022-33903?: CVE-2022-33903 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-33903 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-33903?: CVE-2022-33903 affects Torproject Tor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-33903?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-33903 published?: CVE-2022-33903 was published on 2022-07-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*

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