CVE-2026-32941Public exploitNetwork attack vector

Authenticated server crash via unchecked envelope allocation

Published Mar 20, 2026 · Updated Mar 20, 2026

Denial of service in Bishop Fox Sliver 1.7.3 and earlier allows remote authenticated users to crash the C2 server over mTLS or WireGuard. The socketReadEnvelope and socketWGReadEnvelope functions allocate an attacker-specified length before verifying the envelope signature, while concurrent yamux streams multiply allocations approaching 2 GiB each. Valid implant credentials or a compromised implant are required; exhaustion triggers an OS OOM kill, interrupts active sessions, and can impair colocated processes.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Bishop Fox Sliver 1.7.3 and earlier allows remote authenticated users to crash the C2 server over mTLS or WireGuard. The socketReadEnvelope and socketWGReadEnvelope functions allocate an attacker-specified length before verifying the envelope signature, while concurrent yamux streams multiply allocations approaching 2 GiB each. Valid implant credentials or a compromised implant are required; exhaustion triggers an OS OOM kill, interrupts active sessions, and can impair colocated processes.

The record

CVE
CVE-2026-32941
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Bishop Fox
Product
Sliver
Classifications
CWE-770, CWE-400, CWE-789, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bishop Fox · Sliverversion=<= 1.7.3

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
7.7Bishop FoxCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
CWE-789Memory Allocation with Excessive Size Value
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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