CVE-2025-47913Public exploitNetwork attack vector

Client crash via unexpected agent success reply

Published Nov 13, 2025 · Updated Dec 16, 2025

Denial of service in golang.org/x/crypto/ssh/agent before 0.43.0 allows remote attackers to crash SSH clients via a crafted agent reply. The response decoder turns SSH_AGENT_SUCCESS into successAgentMsg, but List and signing paths expect typed replies and reach panic paths on that decoded type. Reachability requires the client to query an attacker-controlled or compromised SSH agent; exploitation terminates the client process without altering data.

CVSS severity7.5
High
EPSS probability0.62%
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 golang.org/x/crypto/ssh/agent before 0.43.0 allows remote attackers to crash SSH clients via a crafted agent reply. The response decoder turns SSH_AGENT_SUCCESS into successAgentMsg, but List and signing paths expect typed replies and reach panic paths on that decoded type. Reachability requires the client to query an attacker-controlled or compromised SSH agent; exploitation terminates the client process without altering data.

The record

CVE
CVE-2025-47913
Published
Nov 13, 2025
Updated
Dec 16, 2025
Vendor
golang.org/x/crypto
Product
golang.org/x/crypto/ssh/agent
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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=0 <0.43.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

golang.org/x/crypto · golang.org/x/crypto/ssh/agentversion=0 <0.43.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

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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