An authentication bypass vulnerability exists in Avalanche versions 6.3.x and below that could allow an attacker to gain access by exploiti…

published 2023-05-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-31837

cvss: 5.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 66.7%; EPSS 66.7% chance of exploitation in 30 days, percentile 99.2%
public exploits: 0; none known

An authentication bypass vulnerability exists in Avalanche versions 6.3.x and below that could allow an attacker to gain access by exploiting the SetUser method or can exploit the Race Condition in the authentication message.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 21 mo ago (2025-01-29)

Exploit prediction

66.66% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

n/a Avalanche

Classification

Weakness

CWE-305 Authentication Bypass by Primary Weakness
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

forums.ivanti.com /s/article/ZDI-CAN-17750-Ivanti-Avalanche-EnterpriseServer-GetSettings-Exposed-Dangerous-Method-Authentication
vendor-advisory

Sources

CVE List CVE-2023-28126
NVD CVE-2023-28126

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary