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CVE-2020-15237

21
FAUCET Score

CVE-2020-15237 is a timing attack vulnerability affecting Shrine versions prior to 3.3.0, specifically when using the `derivation_endpoint` plugin. An attacker could exploit this to guess the signature of derivation URLs. The vulnerability has a CVSS score of 5.9 (Medium), indicating a network-based attack with high impact on confidentiality and high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.0CPE matchmatch criteria
cpe:2.3:a:shrinerb:shrine:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.01%
Probability of exploitation in next 30 days
EPSS Percentile
59.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0101 is in the 18th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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: shrineFixed in: 3.3.0

Vendor Advisories (1)

rubygemsGHSA-5jjv-x4fq-qjwpmedium

Possible timing attack in derivation_endpoint

Oct 5, 2020

References

github.com / shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0
PatchThird Party Advisory
github.com / shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp
Third Party Advisory