Is CVE-2019-16785 in the CISA KEV catalog?

No. CVE-2019-16785 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-16785?

CVE-2019-16785 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2019-16785?

CVE-2019-16785 has an EPSS score of 2.71% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-16785?

Upgrade waitress on debian 11 to 1.4.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-16785

HIGHEPSS 84th pctl

7.1

CVSS v3

NVD

Description

Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR." Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.

CWE-444

How to fix

Remediation Available

waitressDebian

Fixed in:1.4.1-1CVE-2019-16785

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Exploit Intelligence

2.71%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch2

Exploit1

github.com

Vendor Advisory1

docs.pylonsproject.org

Third-Party Advisory2

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.