Is CVE-2016-9964 in the CISA KEV catalog?

No. CVE-2016-9964 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9964?

CVE-2016-9964 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2016-9964?

CVE-2016-9964 has an EPSS score of 1.76% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9964?

Upgrade python-bottle on debian 11 to 0.12.11-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-9964

MEDIUMEPSS 75th pctl

6.5

CVSS v3

NVD

Description

redirect() in bottle.py in bottle 0.12.10 doesn't filter a "\r\n" sequence, which leads to a CRLF attack, as demonstrated by a redirect("233\r\nSet-Cookie: name=salt") call.

CWE-93

How to fix

Remediation Available

python-bottleDebian

Fixed in:0.12.11-1CVE-2016-9964

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 ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Exploit Intelligence

1.76%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch2

Third-Party Advisory2

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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 2026-05-06.