CVE-2020-15237: In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to

Q: How do I fix CVE-2020-15237?

shrine: upgrade to 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-15237 being exploited?

CVE-2020-15237 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-2020-15237 affect?

CVE-2020-15237 affects shrine. Severity is medium (CVSS 5.9). In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated sig

Q: How urgent is CVE-2020-15237?

Priority 41/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.9REMOTEUPGRADE

CVE-2020-15237 is a medium-severity flaw (CVSS 5.9) affecting shrine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisor

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-203, CWE-208
Published	2020-10-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: shrinerb

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

Am I affected?

Timeline

2020-10-05 19:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

shrinerb shrine UPGRADE

Affected: < 3.3.0

Fixed in: 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shrine

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-2020-15237?

shrine: upgrade to 3.3.0. Exact commands for each OS are on this page.

Is CVE-2020-15237 being exploited?

CVE-2020-15237 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-2020-15237 affect?

CVE-2020-15237 affects shrine. Severity is medium (CVSS 5.9). In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated sig

How urgent is CVE-2020-15237?

Priority 41/100. Remotely exploitable, no login, no user action

References

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