What is CVE-2021-27329?

CVE-2021-27329 is a critical-severity vulnerability in Frendi Frendica, classified under Server-Side Request Forgery (SSRF). CVSS score: 10.0/10. Published 2021-02-18.

How severe is CVE-2021-27329?

Critical severity. CVSS v3 base score is 10.0 out of 10.

SSRF in Frendi Frendica

CVE-2021-27329

Friendica 2021.01 allows SSRF via parse_url?binurl= for DNS lookups or HTTP requests to arbitrary domain names.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2021-02-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (74.0th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Frendi Frendica — versions 2021.01

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/friendica/friendica/issues/9929 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-27329?: CVE-2021-27329 is a critical-severity vulnerability in Frendi Frendica, classified under Server-Side Request Forgery (SSRF). CVSS score: 10.0/10. Published 2021-02-18.
How severe is CVE-2021-27329?: Critical severity. CVSS v3 base score is 10.0 out of 10.