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CVE-2016-9964

18
FAUCET Score

CVE-2016-9964 describes a CRLF injection vulnerability in the redirect() function of bottle.py in Bottle 0.12.10, affecting bottlepy and Debian distributions. This flaw allows an attacker to inject arbitrary HTTP headers by failing to filter newline characters in redirect URLs. Rated 6.5 MEDIUM, it requires user interaction and can lead to high integrity impacts, such as session hijacking. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.12.10CPE matchmatch criteria
cpe:2.3:a:bottlepy:bottle:0.12.10:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 87th percentile among its peer group of 26,219 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: bottleFixed in: 0.12.11

Vendor Advisories (1)

pipGHSA-j6f7-hghw-g437high

bottle.py vulnerable to CRLF Injection

May 17, 2022

References

github.com / bottlepy/bottle/commit/6d7e13da0f998820800ecb3fe9ccee4189aefb54
Issue TrackingPatchThird Party Advisory
github.com / bottlepy/bottle/issues/913
Issue TrackingPatchThird Party Advisory
debian.org / security/2016/dsa-3743
Third Party Advisory
securityfocus.com / bid/94961
Third Party AdvisoryVDB Entry