CVE-2020-18172: A code injection vulnerability in the SeDebugPrivilege component of Trezor Bridge 2.0.27 allows attackers to e

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-18172 is a critical-severity flaw (CVSS 9.8) affecting bridge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A code injection vulnerability in the SeDebugPrivilege component of Trezor Bridge 2.0.27 allows attackers to escalate privileges.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-94
Published	2021-07-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: trezor

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

Am I affected?

Timeline

2021-07-26 20:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

trezor bridge DOWNGRADE

Affected: 2.0.27

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.27

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.27 (Debian / Ubuntu)

apt-cache madison bridge sudo apt install bridge=<VERSION_BEFORE_2.0.27> sudo apt-mark hold bridge

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bridge sudo dnf downgrade bridge-<VERSION_BEFORE_2.0.27> sudo dnf versionlock add bridge

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-18172?

bridge: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-18172 being exploited?

CVE-2020-18172 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-2020-18172 affect?

CVE-2020-18172 affects bridge. Severity is critical (CVSS 9.8). A code injection vulnerability in the SeDebugPrivilege component of Trezor Bridge 2.0.27 allows attackers to escalate privileges.

How urgent is CVE-2020-18172?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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