How severe is CVE-2022-31394?

CVE-2022-31394 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-2022-31394 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-31394?

CVE-2022-31394 affects Hyper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-31394?

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-2022-31394 published?

CVE-2022-31394 was published on 2023-02-21 and last updated on 2026-06-17.

CVE-2022-31394

CVE-2022-31394 is a high-severity vulnerability in Hyper 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. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Hyper
Published: 2023-02-21
Last modified: 2026-06-17

Description

Hyperium Hyper before 0.14.19 does not allow for customization of the max_header_list_size method in the H2 third-party software, allowing attackers to perform HTTP2 attacks.

Frequently asked questions

What is CVE-2022-31394?: Hyperium Hyper before 0.14.19 does not allow for customization of the max_header_list_size method in the H2 third-party software, allowing attackers to perform HTTP2 attacks.
How severe is CVE-2022-31394?: CVE-2022-31394 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-2022-31394 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-31394?: CVE-2022-31394 affects Hyper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-31394?: 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-2022-31394 published?: CVE-2022-31394 was published on 2023-02-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hyper:hyper:*:*:*:*:*:rust:*:*

More vulnerabilities in Hyper

CVE-2020-35863 — Critical (CVSS 9.8): An issue was discovered in the hyper crate before 0.12.34 for Rust. HTTP request smuggling can occur. Remote code…
CVE-2023-26964 — High (CVSS 7.5): An issue was discovered in hyper v0.13.7. h2-0.2.4 Stream stacking occurs when the H2 component processes HTTP2…
CVE-2021-32714 — Medium (CVSS 5.9): hyper is an HTTP library for Rust. In versions prior to 0.14.10, hyper's HTTP server and client code had a flaw that…
CVE-2017-18587 — Medium (CVSS 5.3): An issue was discovered in the hyper crate before 0.9.18 for Rust. It mishandles newlines in headers.
CVE-2021-21299 — Medium (CVSS 4.8): hyper is an open-source HTTP library for Rust (crates.io). In hyper from version 0.12.0 and before versions 0.13.10 and…
CVE-2016-10932 — Medium (CVSS 4.8): An issue was discovered in the hyper crate before 0.9.4 for Rust on Windows. There is an HTTPS man-in-the-middle…

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