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CVE-2020-25739

21
FAUCET Score

CVE-2020-25739 is a cross-site scripting (XSS) vulnerability in the gon gem for Ruby, affecting versions prior to 6.4.0, as well as various Canonical and Debian Linux distributions. The vulnerability stems from MultiJson failing to properly escape fields, which could allow an attacker to inject malicious scripts. Rated as MEDIUM severity (CVSS 6.1), it requires user interaction and network access, potentially leading to low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.4.0CPE matchmatch criteria
cpe:2.3:a:gon_project:gon:*:*:*:*:*:ruby:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.38%
Probability of exploitation in next 30 days
EPSS Percentile
69.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0138 is in the 82nd percentile among its peer group of 26,221 CVEs.

Social Chatter

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
rubygemspatch availablevia ghsa
Product: gonFixed in: 6.4.0

Vendor Advisories (1)

rubygemsGHSA-78vq-9j56-wrfrmedium

Gon gem lack of escaping certain input when outputting as JSON

Apr 30, 2021

References

github.com / gazay/gon/commit/fe3c7b2191a992386dc9edd37de5447a4e809bc7
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2020/09/msg00018.html
Mailing ListThird Party Advisory
usn.ubuntu.com / 4560-1
Third Party Advisory