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CVE-2021-36780

26
FAUCET Score

CVE-2021-36780 is a critical authentication bypass vulnerability affecting SUSE Longhorn versions prior to 1.1.3 and 1.2.3. An attacker can connect to a longhorn-engine replica instance without authentication, gaining unauthorized read and write access to data. With a CVSS score of 8.1 (HIGH), this vulnerability has a low attack complexity and requires only adjacent network access, allowing for high confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.3CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:longhorn:*:*:*:*:*:*:*:*
>= 1.2.0, < 1.2.3CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:longhorn:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 34th percentile among its peer group of 1,859 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

bugzilla.suse.com / show_bug.cgi
Issue TrackingVendor Advisory
github.com / longhorn/longhorn/security/advisories/GHSA-g358-m2wp-mhhx
Third Party Advisory