How severe is CVE-2019-16771?

CVE-2019-16771 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-16771 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-2019-16771?

CVE-2019-16771 affects Linecorp Armeria. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16771?

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

When was CVE-2019-16771 published?

CVE-2019-16771 was published on 2019-12-06 and last updated on 2026-06-17.

CVE-2019-16771

CVE-2019-16771 is a medium-severity vulnerability in Linecorp Armeria with a CVSS 3.x base score of 4.8. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 5.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Linecorp Armeria
Published: 2019-12-06
Last modified: 2026-06-17

Description

Versions of Armeria 0.85.0 through and including 0.96.0 are vulnerable to HTTP response splitting, which allows remote attackers to inject arbitrary HTTP headers via CRLF sequences when unsanitized data is used to populate the headers of an HTTP response. This vulnerability has been patched in 0.97.0. Potential impacts of this vulnerability include cross-user defacement, cache poisoning, Cross-site scripting (XSS), and page hijacking.

Frequently asked questions

What is CVE-2019-16771?: Versions of Armeria 0.85.0 through and including 0.96.0 are vulnerable to HTTP response splitting, which allows remote attackers to inject arbitrary HTTP headers via CRLF sequences when unsanitized data is used to populate the headers of an HTTP response. This vulnerability has been patched in 0.97.0. Potential impacts of this vulnerability include cross-user defacement, cache poisoning, Cross-site scripting (XSS), and page hijacking.
How severe is CVE-2019-16771?: CVE-2019-16771 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-16771 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-2019-16771?: CVE-2019-16771 affects Linecorp Armeria. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16771?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16771 published?: CVE-2019-16771 was published on 2019-12-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linecorp:armeria:*:*:*:*:*:*:*:*

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