Is this vulnerability remotely exploitable?

Yes. Any remote actor who can reach the DNS C2 listener over the network can exploit this issue without valid credentials or a correct OTP value.

What level of access does an attacker need?

The attacker only needs network-level access to the DNS C2 endpoint. No prior authentication, enrollment, or control over Sliver agents is required to trigger memory exhaustion.

What is the safest general fix pattern?

The safest pattern is to enforce OTP and authentication checks before any session or persistent-state allocation, and to ensure all session creation paths have robust expiry and cleanup. Additionally, applying rate limiting and quotas on bootstrap flows can provide a strong secondary safeguard.

Severity:

HIGH RISK

(7.5)

Improper Authentication & Unbounded Resource Allocation (CWE-306, CWE-400) in Sliver DNS C2 Listener

CVE-2026-25791

Published:

Feb 9, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Improper Authentication and Resource Exhaustion

CWE:

CWE-306;CWE-400

Impact:

Denial of Service via Memory Exhaustion

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Authentication and Resource Exhaustion

CWE:

CWE-306;CWE-400

Impact:

Denial of Service via Memory Exhaustion

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Improper Authentication & Unbounded Resource Allocation (CWE-306, CWE-400) in Sliver DNS C2 Listener

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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