CVE-2020-15879

CVE-2020-15879 is a high-severity vulnerability in Bitwarden Server with a CVSS 3.x base score of 7.5. 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

Description

Bitwarden Server 1.35.1 allows SSRF because it does not consider certain IPv6 addresses (ones beginning with fc, fd, fe, or ff, and the :: address) and certain IPv4 addresses (0.0.0.0/8, 127.0.0.0/8, and 169.254.0.0/16).

Frequently asked questions

What is CVE-2020-15879?
Bitwarden Server 1.35.1 allows SSRF because it does not consider certain IPv6 addresses (ones beginning with fc, fd, fe, or ff, and the :: address) and certain IPv4 addresses (0.0.0.0/8, 127.0.0.0/8, and 169.254.0.0/16).
How severe is CVE-2020-15879?
CVE-2020-15879 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-15879 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15879?
CVE-2020-15879 affects Bitwarden Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15879?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-15879 published?
CVE-2020-15879 was published on 2020-07-21 and last updated on 2026-06-17.

References

Affected products (1)

More vulnerabilities in Bitwarden Server

All CVEs affecting Bitwarden Server →

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities

Browse all CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities →