How severe is CVE-2020-5404?

CVE-2020-5404 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2020-5404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5404?

CVE-2020-5404 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-5404 published?

CVE-2020-5404 was published on 2020-03-03 and last updated on 2026-06-17.

CVE-2020-5404

CVE-2020-5404 is a medium-severity vulnerability in Pivotal Reactor Netty with a CVSS 3.x base score of 5.9. 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-522.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.9
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Pivotal Reactor Netty
Published: 2020-03-03
Last modified: 2026-06-17

Description

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 incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects.

Frequently asked questions

What is CVE-2020-5404?: 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 incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects.
How severe is CVE-2020-5404?: CVE-2020-5404 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2020-5404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5404?: CVE-2020-5404 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-5404 published?: CVE-2020-5404 was published on 2020-03-03 and last updated on 2026-06-17.

References

https://pivotal.io/security/cve-2020-5404

Affected products (1)

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

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