Bitwarden
CVE-2020-15879
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V4 - API and Web Service URL allowlisting, SSRF prevention
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. |
| Exploit ScenarioDerived | A remote attacker could make the server perform requests to unintended internal or external resources by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
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,. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate and allowlist destination URLs, block requests to internal networks, use network segmentation.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Server-Side Request Forgery (SSRF) (CWE-918), which allows attackers to make the server perform requests to unintended internal or external resources. 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). Affected products include: Bitwarden Server.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
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).
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.
Affected Products (CPE)NVD
Account takeover in self-hosted Bitwarden Server before 2026.6.0 lets a low-privileged organization member steal any oth
Provider service users in Bitwarden Server Cloud can hijack arbitrary organizations via unauthorized API endpoint access
Authentication bypass in Bitwarden Server versions prior to 2026.4.1 allows authenticated users with SCIM management pri
Authentication bypass in self-hosted Bitwarden Server versions 2025.6.0 through 2026.5.0 backed by Microsoft SQL Server
Bitwarden through 2023.2.1 offers password auto-fill when the second-level domain matches, e.g., a password stored for a
Privilege escalation in self-hosted Bitwarden Server before 2026.5.0 lets an authenticated organization member holding a
Bitwarden Windows desktop application versions prior to v2023.4.0 store biometric keys in Windows Credential Manager, ac
Audit log integrity across all Bitwarden Server organizations can be undermined by any authenticated user, who may injec
Broken access control in Bitwarden Server before 2026.5.0 exposes organization billing data to any authenticated user vi
Bitwarden Server prior to v2026.4.1 allows any authenticated user to write ciphers (encrypted credentials) into arbitrar
Malicious code injection in Bitwarden CLI 2026.4.0 distributed via npm for 90 minutes on April 22, 2026, enables remote
The Bitwarden server through 1.32.0 has a potentially unwanted KDF. Rated high severity (CVSS 7.5), this vulnerability i
Exploit-DB