How severe is CVE-2019-11284?

CVE-2019-11284 has a CVSS 3.x base score of 8.6, 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-2019-11284 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11284?

CVE-2019-11284 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11284?

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-2019-11284 published?

CVE-2019-11284 was published on 2019-10-17 and last updated on 2026-06-17.

CVE-2019-11284

CVE-2019-11284 is a high-severity vulnerability in Pivotal Reactor Netty with a CVSS 3.x base score of 8.6. 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: High (CVSS 3.x base score 8.6)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Pivotal Reactor Netty
Published: 2019-10-17
Last modified: 2026-06-17

Description

Pivotal Reactor Netty, versions prior to 0.8.11, passes headers through redirects, including authorization ones. A remote unauthenticated malicious user may gain access to credentials for a different server than they have access to.

Frequently asked questions

What is CVE-2019-11284?: Pivotal Reactor Netty, versions prior to 0.8.11, passes headers through redirects, including authorization ones. A remote unauthenticated malicious user may gain access to credentials for a different server than they have access to.
How severe is CVE-2019-11284?: CVE-2019-11284 has a CVSS 3.x base score of 8.6, 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-2019-11284 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11284?: CVE-2019-11284 affects Pivotal Reactor Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11284?: 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-2019-11284 published?: CVE-2019-11284 was published on 2019-10-17 and last updated on 2026-06-17.

References

https://pivotal.io/security/cve-2019-11284

Affected products (1)

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

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