PatchTheCVECVE-2021-43549: A remote authenticated attacker with write access to a PI Server could trick a user into interacting with a PI
CVE-2021-43549 is a medium-severity flaw (CVSS 6.9) affecting pi web api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A remote authenticated attacker with write access to a PI Server could trick a user into interacting with a PI Web API endpoint and redirect them to a malicious website. As a result, a victim may disclose sensitive information to the attacker or be provided with false information.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | Required |
| EPSS exploit chance | 0.7% (top 46%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-11-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2021-43549?
pi web api: upgrade to newer than 2019. Exact commands for each OS are on this page.
Is CVE-2021-43549 being exploited?
CVE-2021-43549 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-2021-43549 affect?
CVE-2021-43549 affects pi web api. Severity is medium (CVSS 6.9). A remote authenticated attacker with write access to a PI Server could trick a user into interacting with a PI Web API endpoint and redirect them to a malicious website. As a result, a victim may disclose sensitive information to the attack
How urgent is CVE-2021-43549?
Priority 38/100. No elevated risk signals yet.