How severe is CVE-2021-27329?

CVE-2021-27329 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27329 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27329?

CVE-2021-27329 affects Frendi Frendica. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27329?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-27329 published?

CVE-2021-27329 was published on 2021-02-18 and last updated on 2026-06-17.

CVE-2021-27329

CVE-2021-27329 is a critical-severity vulnerability in Frendi Frendica with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 10.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Frendi Frendica
Published: 2021-02-18
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-27329?: Friendica 2021.01 allows SSRF via parse_url?binurl= for DNS lookups or HTTP requests to arbitrary domain names.
How severe is CVE-2021-27329?: CVE-2021-27329 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27329 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27329?: CVE-2021-27329 affects Frendi Frendica. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27329?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27329 published?: CVE-2021-27329 was published on 2021-02-18 and last updated on 2026-06-17.

References

https://github.com/friendica/friendica/issues/9929

Affected products (1)

cpe:2.3:a:frendi:frendica:2021.01:*:*:*:*:*:*:*

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