CVE-2016-1000108: yaws before 2.0.4 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does n

Q: How do I fix CVE-2016-1000108?

yaws: upgrade to 2.0.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2016-1000108 being exploited?

CVE-2016-1000108 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-1000108 affect?

CVE-2016-1000108 affects yaws, debian linux. Severity is medium (CVSS 6.1). yaws before 2.0.4 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow r

Q: How urgent is CVE-2016-1000108?

Priority 43/100. On your watchlist

This month

MEDIUM 6.1WATCHLISTUPGRADEMITIGATE

CVE-2016-1000108 is a medium-severity flaw (CVSS 6.1) affecting yaws, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

yaws before 2.0.4 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-601
Published	2019-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · yaws

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-10 15:15 UTCPublished CVE record published
2026-06-17 00:38 UTCUpdated Record last modified

yaws yaws UPGRADE

Affected: < 2.0.4

Fixed in: 2.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy yaws || rpm -q yaws || yaws --version

2. UPGRADE to 2.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yaws

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yaws

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-1000108?

yaws: upgrade to 2.0.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-1000108 being exploited?

CVE-2016-1000108 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-1000108 affect?

CVE-2016-1000108 affects yaws, debian linux. Severity is medium (CVSS 6.1). yaws before 2.0.4 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow r

How urgent is CVE-2016-1000108?

Priority 43/100. On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2020-24916 CRITICAL 9.8 UPGRADE MITIGATE CGI implementation in Yaws web server versions 1.81 to 2.0.7 is vulnerable to OS command injection.
CVE-2020-24379 CRITICAL 9.8 UPGRADE MITIGATE WebDAV implementation in Yaws web server versions 1.81 to 2.0.7 is vulnerable to XXE injection.
CVE-2020-12872 MEDIUM 5.5 UPGRADE yaws_config.erl in Yaws through 2.0.2 and/or 2.0.7 loads obsolete TLS ciphers, as demonstrated by ones that al
CVE-2017-10974 HIGH 7.5 DOWNGRADE Yaws 1.91 allows Unauthenticated Remote File Disclosure via HTTP Directory Traversal with /%5C../ to port 8080
CVE-2011-4350 MEDIUM 6.5 DOWNGRADE MITIGATE Yaws 1.91 has a directory traversal vulnerability in the way certain URLs are processed

References

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