CVE-2021-31314: File upload vulnerability in ejinshan v8+ terminal security system allows attackers to upload arbitrary files

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-31314 is a critical-severity flaw (CVSS 9.8) affecting terminal security system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

File upload vulnerability in ejinshan v8+ terminal security system allows attackers to upload arbitrary files to arbitrary locations on the server.

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	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-01-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ejinshan

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

Am I affected?

Timeline

2024-01-20 01:15 UTCPublished CVE record published
2026-06-17 03:51 UTCUpdated Record last modified

ejinshan terminal security system DOWNGRADE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

1. Check installed version

apt-cache policy terminal-security-system || rpm -q terminal-security-system || terminal-security-system --version

2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)

apt-cache madison terminal-security-system sudo apt install terminal-security-system=<VERSION_BEFORE_8.0> sudo apt-mark hold terminal-security-system

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

dnf --showduplicates list terminal-security-system sudo dnf downgrade terminal-security-system-<VERSION_BEFORE_8.0> sudo dnf versionlock add terminal-security-system

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-2021-31314?

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

Is CVE-2021-31314 being exploited?

CVE-2021-31314 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-2021-31314 affect?

CVE-2021-31314 affects terminal security system. Severity is critical (CVSS 9.8). File upload vulnerability in ejinshan v8+ terminal security system allows attackers to upload arbitrary files to arbitrary locations on the server.

How urgent is CVE-2021-31314?

Priority 58/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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