CVE-2025-61932ExploitPublished 6 Nov 2025

APT 'Bronze Butler' Exploits Zero-Day to Root Japan Orgs

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Authoritative record:CVE-2025-61932· Critical 9.8

Exploited in the wild · KEV due 12 Nov 2025 : apply the vendor's fix or mitigations to affected systems now.

Data as of 19 Nov 2025, 01:30 UTC

CVSS 3.0 base score

9.8Critical

How severe the flaw is on the 0–10 CVSS scale.

KEV deadline: 12 Nov 2025 US federal agencies must patch by this date; a sensible deadline for everyone else. Other KEV due dates

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 20 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 2 days after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by JPCERT/CC
6 Oct 202502:24 UTC, 14 days before disclosure
CVE published
on cve.org
20 Oct 202507:25 UTC, t = 0
In Threat Radar
record ingested
20 Oct 202507:38 UTC, 13 minutes after disclosure
Added to CISA KEV (opens in a new tab)
exploitation confirmed
22 Oct 2025, 2 days after disclosure
KEV remediation due
US federal deadline
12 Nov 2025, 23 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Immediately audit and restrict access to the endpoint management platform, limiting it to essential personnel and systems only.
Implement enhanced network segmentation to isolate endpoint management servers from critical assets.
Deploy advanced endpoint detection and response (EDR) solutions capable of identifying unusual privilege escalations and backdoor activity.
Monitor network traffic for anomalies, especially connections to suspicious external IPs or command and control servers.
Conduct thorough threat hunting exercises focusing on indicators of compromise related to 'Bronze Butler' tactics and techniques.
Prepare incident response plans specifically for endpoint management compromise scenarios.
Engage with the vendor for early access to patches or workarounds and apply them promptly upon release.
Educate IT and security teams about this specific threat to improve detection and response capabilities.
Consider deploying application whitelisting and restricting execution of unauthorized binaries on endpoints managed by the platform.
Collaborate with national cybersecurity agencies and industry groups to share intelligence and mitigation strategies.

Description

A critical security issue in a popular endpoint manager (CVE-2025-61932) allowed Chinese state-sponsored attackers to backdoor Japanese businesses.

Impact

For European organizations, the impact could be substantial due to the widespread use of the affected endpoint management software across various industries including finance, manufacturing, and critical infrastructure. Successful exploitation would allow attackers to gain root access, leading to full control over endpoint devices, enabling data theft, espionage, and potential disruption of business operations. This could result in significant financial losses, reputational damage, and regulatory penalties under GDPR if personal data is compromised. The stealthy nature of backdoors implanted by APT groups complicates detection and remediation efforts. Additionally, the geopolitical implications of a Chinese state-sponsored group targeting allied or economically linked countries could increase the likelihood of targeted attacks in Europe. The absence of patches means organizations must rely on defensive measures and threat intelligence to mitigate risk. The potential for lateral movement within networks could escalate the threat from isolated endpoints to enterprise-wide compromise.

References

darkreading.com/application-security/bronze-butler-apt-exploits-zero-day-vuln-root-japan (opens in a new tab)

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