How severe is CVE-2020-1695?

CVE-2020-1695 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2020-1695?

CVE-2020-1695 affects the following packages: org.jboss.resteasy:resteasy-client (Maven), org.jboss.resteasy:resteasy-client (Maven). Ecosystems affected: Maven.

How do I fix CVE-2020-1695?

Update org.jboss.resteasy:resteasy-client to 4.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-1695 is resolved across your whole dependency graph.

How do I detect CVE-2020-1695 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2020-1695 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2020-1695 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-1695 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-1695?

CVE-2020-1695 has an EPSS (Exploit Prediction Scoring System) score of 2.0%, placing it in the 81th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2020-1695?

CVE-2020-1695 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2020-1695 published, and has it been updated?

CVE-2020-1695 was published on May 19, 2020 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

HIGH severity

CVE-2020-1695 — resteasy-client

HIGHFix: resteasy/Resteasy@88ba853

CVE-2020-1695 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in org.jboss.resteasy:resteasy-client. A fix is available for org.jboss.resteasy:resteasy-client — see the affected versions and patch details below.

Improper Input Validation in RESTEasy

Also known asGHSA-63cq-ppq8-cw6g

Published

May 19, 2020

Updated

Oct 24, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.0%probability of exploitation in next 30 days

Lower Risk+0.05%

Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

☕org.jboss.resteasy:resteasy-client☕org.jboss.resteasy:resteasy-client

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

A flaw was found in all resteasy 3.x.x versions prior to 3.12.0.Final and all resteasy 4.x.x versions prior to 4.6.0.Final, where an improper input validation results in returning an illegal header that integrates into the server's response. This flaw may result in an injection, which leads to unexpected behavior when the HTTP response is constructed.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jboss.resteasy:resteasy-client`	≥ 4.0.0&&< 4.6.0	4.6.0`org.jboss.resteasy:resteasy-client:4.6.0`
☕Maven	`org.jboss.resteasy:resteasy-client`	≥ 3.0.0&&< 3.12.0	3.12.0`org.jboss.resteasy:resteasy-client:3.12.0`

Affected Products

2 products · 4 configurations

fedorafedoraproject

2 versions

3233

Application

resteasyredhat

≥ 4.0.0 && < 4.6.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jboss.resteasy:resteasy-client to 4.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-1695 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
EAP-CD 19 Tech Preview	`resteasy-jaxrs`	RHSA-2020:2333
Red Hat Data Grid 7.3.7	`resteasy-jaxrs`	RHSA-2020:3779
Red Hat Enterprise Linux 8	`pki-core:10.6-8040020210324135707.d4d99205`	RHSA-2021:1775
Red Hat Fuse 7.9	`resteasy-jaxrs`	RHSA-2021:3140
Red Hat JBoss EAP 7	`resteasy-jaxrs`	RHSA-2020:2515
Red Hat JBoss Enterprise Application Platform 7	`resteasy-jaxrs`	RHSA-2020:3642
Red Hat JBoss Enterprise Application Platform 7.2 for RHEL 6	`eap7-dom4j-0:2.1.3-1.redhat_00001.1.el6eap`	RHSA-2020:3637
Red Hat JBoss Enterprise Application Platform 7.2 for RHEL 7	`eap7-dom4j-0:2.1.3-1.redhat_00001.1.el7eap`	RHSA-2020:3638

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2020-1695 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE Classification

CWE-20Improper Input Validation

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

Resteasy

4.5/10

Code-Review0/10

Maintained10/10

Branch-ProtectionN/A

Assessed Oct 19, 2026

Timeline

Disclosed

May 19, 2020

Last updated

Oct 24, 2026

Identifiers

CVE-2020-1695

GHSA-63cq-ppq8-cw6g

References

Advisorynvd.nist.gov · CVE 2020 1695 Fixbugzilla.redhat.com · show bug.cgi Weblists.fedoraproject.org · IJDMT443YZWCBS5NS76XZ7TL3GK7BXHL Weblists.fedoraproject.org · RX22C6I56BJUER76IIPYHGZIWBQIU3CQ Webgithub.com · 88ba8537f2e8d465c7031d352bf9bb25526ce475 Weblists.fedoraproject.org · IJDMT443YZWCBS5NS76XZ7TL3GK7BXHL Weblists.fedoraproject.org · RX22C6I56BJUER76IIPYHGZIWBQIU3CQ

Related vulnerabilities

Also affects resteasy-client

This CVE is high severity; 1 of 6 other CVEs affecting resteasy-client is rated as high or higher (top: high).

CVE-2016-6348CVE-2016-6347CVE-2016-6345CVE-2012-0818CVE-2014-3490CVE-2020-25633

Same weakness: CWE-20

This CVE is high severity; 2 of 2 other CVEs with CWE-20 are rated as high or higher (top: critical).

CVE-2026-62662GHSA-fmc8-p6q7-75ccBrowse all CWE-20

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2020-1695 — resteasy-client

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Fixing This On Your OS

Frequently Asked Questions

Is CVE-2020-1695 in your dependencies?