How severe is CVE-2019-6802?

CVE-2019-6802 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-6802 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6802?

CVE-2019-6802 affects Python Pypiserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6802?

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

When was CVE-2019-6802 published?

CVE-2019-6802 was published on 2019-01-25 and last updated on 2026-06-17.

CVE-2019-6802

CVE-2019-6802 is a medium-severity vulnerability in Python Pypiserver with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Python Pypiserver
Published: 2019-01-25
Last modified: 2026-06-17

Description

CRLF Injection in pypiserver 1.2.5 and below allows attackers to set arbitrary HTTP headers and possibly conduct XSS attacks via a %0d%0a in a URI.

Frequently asked questions

What is CVE-2019-6802?: CRLF Injection in pypiserver 1.2.5 and below allows attackers to set arbitrary HTTP headers and possibly conduct XSS attacks via a %0d%0a in a URI.
How severe is CVE-2019-6802?: CVE-2019-6802 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-6802 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6802?: CVE-2019-6802 affects Python Pypiserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6802?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-6802 published?: CVE-2019-6802 was published on 2019-01-25 and last updated on 2026-06-17.

References

https://github.com/pypiserver/pypiserver/issues/237

Affected products (1)

cpe:2.3:a:python:pypiserver:*:*:*:*:*:*:*:*

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