CVE-2021-44164: Chain Sea ai chatbot system’s file upload function has insufficient filtering for special characters in URLs,

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2021-44164 is a critical-severity flaw (CVSS 9.8) affecting qb smart service robot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Chain Sea ai chatbot system’s file upload function has insufficient filtering for special characters in URLs, which allows a remote attacker to by-pass file type validation, upload malicious script and execute arbitrary code without authentication, in order to take control of the system or terminate service.

Why this priority

Critical severity
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	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-12-20
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: chinasea

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

Am I affected?

Timeline

2021-12-20 03:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

chinasea qb smart service robot MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy qb-smart-service-robot || rpm -q qb-smart-service-robot || qb-smart-service-robot --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2021-44164?

qb smart service robot: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-44164 being exploited?

CVE-2021-44164 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-2021-44164 affect?

CVE-2021-44164 affects qb smart service robot. Severity is critical (CVSS 9.8). Chain Sea ai chatbot system’s file upload function has insufficient filtering for special characters in URLs, which allows a remote attacker to by-pass file type validation, upload malicious script and execute arbitrary code without authent

How urgent is CVE-2021-44164?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-44163 MEDIUM 6.1 MITIGATE Chain Sea ai chatbot backend has improper filtering of special characters in URL parameters, which allows a re
CVE-2021-44162 HIGH 7.5 MITIGATE Chain Sea ai chatbot system’s specific file download function has path traversal vulnerability

References

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