CVE-2024-55215: An issue in trojan v.2.0.0 through v.2.15.3 allows a remote attacker to escalate privileges via the initializa

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CRITICAL 9.8REMOTEUPGRADE

CVE-2024-55215 is a critical-severity flaw (CVSS 9.8) affecting trojan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in trojan v.2.0.0 through v.2.15.3 allows a remote attacker to escalate privileges via the initialization interface /auth/register.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-276
Published	2025-02-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jrohy

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

Am I affected?

Timeline

2025-02-07 22:15 UTCPublished CVE record published
2026-06-17 08:11 UTCUpdated Record last modified

jrohy trojan UPGRADE

Affected: >= 2.0.0 and <= 2.15.3

Fixed in: newer than 2.15.3

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to newer than 2.15.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade trojan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison trojan sudo apt install trojan=<VERSION_BEFORE_2.0.0> sudo apt-mark hold trojan

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list trojan sudo dnf downgrade trojan-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add trojan

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-2024-55215?

trojan: upgrade to newer than 2.15.3. Exact commands for each OS are on this page.

Is CVE-2024-55215 being exploited?

CVE-2024-55215 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-2024-55215 affect?

CVE-2024-55215 affects trojan. Severity is critical (CVSS 9.8). An issue in trojan v.2.0.0 through v.2.15.3 allows a remote attacker to escalate privileges via the initialization interface /auth/register.

How urgent is CVE-2024-55215?

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

Related CVEs

CVE-2025-5525 MEDIUM 5.6 UPGRADE A vulnerability was found in Jrohy trojan up to 2.15.3

References

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