CVE-2019-17513: An issue was discovered in Ratpack before 1.7.5

Q: How do I fix CVE-2019-17513?

ratpack: upgrade to 1.7.5. Exact commands for each OS are on this page.

Q: Is CVE-2019-17513 being exploited?

CVE-2019-17513 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-2019-17513 affect?

CVE-2019-17513 affects ratpack. Severity is high (CVSS 7.5). An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with

Q: How urgent is CVE-2019-17513?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2019-17513 is a high-severity flaw (CVSS 7.5) affecting ratpack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with Ratpack, HTTP Response Splitting can occur.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-74
Published	2019-10-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ratpack project

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

Am I affected?

Timeline

2019-10-18 03:15 UTCPublished CVE record published
2026-06-17 02:24 UTCUpdated Record last modified

ratpack project ratpack UPGRADE

Affected: < 1.7.5

Fixed in: 1.7.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.7.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ratpack

Note

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

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-2019-17513?

ratpack: upgrade to 1.7.5. Exact commands for each OS are on this page.

Is CVE-2019-17513 being exploited?

CVE-2019-17513 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-2019-17513 affect?

CVE-2019-17513 affects ratpack. Severity is high (CVSS 7.5). An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with

How urgent is CVE-2019-17513?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2021-29479 HIGH 7.0 UPGRADE Ratpack is a toolkit for creating web applications
CVE-2019-11808 LOW 3.7 UPGRADE Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLoc

References

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