CVE-2017-10974: Yaws 1.91 allows Unauthenticated Remote File Disclosure via HTTP Directory Traversal with /%5C../ to port 8080

This week

HIGH 7.5REMOTEWATCHLISTDOWNGRADE

CVE-2017-10974 is a high-severity flaw (CVSS 7.5) affecting yaws. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Yaws 1.91 allows Unauthenticated Remote File Disclosure via HTTP Directory Traversal with /%5C../ to port 8080. NOTE: this CVE is only about use of an initial /%5C sequence to defeat traversal protection mechanisms; the initial /%5C sequence was apparently not discussed in earlier research on this product.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	81.2% (top 1%)
CISA exploited list	No
Weakness	CWE-22
Published	2017-07-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yaws

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

Am I affected?

Timeline

2017-07-07 11:29 UTCPublished CVE record published
2026-06-17 01:01 UTCUpdated Record last modified

yaws yaws DOWNGRADE

Affected: 1.91

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.91

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.91 (Debian / Ubuntu)

apt-cache madison yaws sudo apt install yaws=<VERSION_BEFORE_1.91> sudo apt-mark hold yaws

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list yaws sudo dnf downgrade yaws-<VERSION_BEFORE_1.91> sudo dnf versionlock add yaws

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Yaws 1.91 - Remote File Disclosure
Nuclei scan template: Yaws 1.91 - Local File Inclusion

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-2017-10974?

yaws: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-10974 being exploited?

CVE-2017-10974 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-2017-10974 affect?

CVE-2017-10974 affects yaws. Severity is high (CVSS 7.5). Yaws 1.91 allows Unauthenticated Remote File Disclosure via HTTP Directory Traversal with /%5C../ to port 8080. NOTE: this CVE is only about use of an initial /%5C sequence to defeat traversal protection mechanisms; the initial /%5C sequenc

How urgent is CVE-2017-10974?

Priority 66/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

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-2016-1000108 MEDIUM 6.1 UPGRADE MITIGATE yaws before 2.0.4 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does n
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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