How severe is CVE-2023-34062?

CVE-2023-34062 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 high, integrity none, and availability none.

Is CVE-2023-34062 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34062?

CVE-2023-34062 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34062?

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-2023-34062 published?

CVE-2023-34062 was published on 2023-11-15 and last updated on 2026-06-17.

CVE-2023-34062

CVE-2023-34062 is a high-severity vulnerability in Pivotal Reactor Netty 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Pivotal Reactor Netty
Published: 2023-11-15
Last modified: 2026-06-17

Description

In Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attack. Specifically, an application is vulnerable if Reactor Netty HTTP Server is configured to serve static resources.

Frequently asked questions

What is CVE-2023-34062?: In Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attack. Specifically, an application is vulnerable if Reactor Netty HTTP Server is configured to serve static resources.
How severe is CVE-2023-34062?: CVE-2023-34062 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 high, integrity none, and availability none.
Is CVE-2023-34062 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34062?: CVE-2023-34062 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34062?: 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-2023-34062 published?: CVE-2023-34062 was published on 2023-11-15 and last updated on 2026-06-17.

References

https://spring.io/security/cve-2023-34062

Affected products (1)

cpe:2.3:a:pivotal:reactor_netty:*:*:*:*:*:*:*:*

More vulnerabilities in Pivotal Reactor Netty

CVE-2019-11284 — High (CVSS 8.6): Pivotal Reactor Netty, versions prior to 0.8.11, passes headers through redirects, including authorization ones. A…
CVE-2020-5403 — High (CVSS 7.5): Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be…
CVE-2020-5404 — Medium (CVSS 5.9): The HttpClient from Reactor Netty, versions 0.9.x prior to 0.9.5, and versions 0.8.x prior to 0.8.16, may be used…
CVE-2023-34054 — Medium (CVSS 5.3): In Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, it is possible for a…
CVE-2022-31684 — Medium (CVSS 4.3): Reactor Netty HTTP Server, in versions 1.0.11 - 1.0.23, may log request headers in some cases of invalid HTTP requests.…

All CVEs affecting Pivotal Reactor Netty →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…

Browse all CWE-22 (Path Traversal) vulnerabilities →