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In January 2024, Volexity reported that attackers were exploiting two Ivanti Connect Secure VPN flaws to run commands on appliances without authenticating. It tracked the intruder as UTA0178 and said it had reason to believe the group was a Chinese nation-state-level threat actor. That is Volexity’s qualified assessment, not a public government attribution in the cited material.
Which Ivanti VPN flaws were exploited?
Volexity’s January 10, 2024 report described attackers chaining two vulnerabilities in Ivanti Connect Secure appliances. The combination enabled unauthenticated remote code execution: attackers could reach the appliance and run commands without first logging in.
| Vulnerability | What it enabled in the reported chain | CVSS score reported by Volexity |
|---|---|---|
| CVE-2023-46805 | Authentication bypass | 8.2 |
| CVE-2024-21887 | Command injection | 9.1 |
Volexity said the attackers used the flaws together; the scores above are the values in its report. A later joint government advisory also covered CVE-2024-21893, along with these two flaws, across supported 9.x and 22.x versions. It described ways the flaws could be chained to bypass authentication, send malicious requests, and execute commands with elevated privileges. That broader advisory scope should not be mistaken for evidence that CVE-2024-21893 was part of the specific exploit chain Volexity first reported.
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In the intrusion Volexity investigated, access to the VPN appliance was a foothold for both theft and further movement into the victim’s environment.
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The joint government advisory described a broader set of observed consequences across incident response cases, including web shells, credential harvesting, lateral movement, and, in some cases, full-domain compromise. Those outcomes show why investigating the appliance alone may not be enough.
Was the activity attributed to Chinese hackers?
Volexity tracked the actor as UTA0178 and said it had reason to believe the group was a Chinese nation-state-level threat actor. This is a qualified attribution by Volexity; the cited material does not provide a public government attribution of the activity to China. Volexity also observed other threat actors with access to the exploit, so defenders should not assume every related intrusion had the same operator.
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How many Ivanti Connect Secure appliances were compromised?
On January 15, 2024, Volexity reported evidence of compromise on more than 1,700 Ivanti Connect Secure devices worldwide. That was a dated scan result, not a final count of affected organizations or a definitive victim total. Volexity warned that its method could miss organizations that had already mitigated the issue or taken appliances offline.
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Why can a clean integrity check or factory reset be misleading?
The joint government advisory warned that attackers could deceive Ivanti’s internal and external Integrity Checker Tools. A clean result therefore does not establish that an appliance is uncompromised. CISA lab work also found that root-level persistence could survive a factory reset, so resetting a device is not proof that malicious access has been removed.
The advisory cautioned that some IP addresses in its indicator lists may be legitimate. Treat them as leads to investigate in context rather than automatically blocking every listed address.
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What should defenders do if an appliance may have been exposed?
The advisory’s recommendations point to a response that covers the device, accounts, and the wider network. Apply Ivanti’s patching guidance and use the latest external checker, but do not rely on checker output alone to clear an appliance.
- Preserve evidence and assess the appliance. If compromise is suspected, collect logs and forensic artifacts. Hunt for malicious activity using the published indicators, and investigate any matching IP addresses before deciding whether to block them.
- Patch, and distinguish patching from mitigation. Follow Ivanti’s patching guidance for the affected appliance. A mitigation can reduce exposure, but it is not the same as fully patching the vulnerability; neither step, by itself, proves that an already-compromised device is clean.
- Use integrity checks as one input. Run the latest external checker, but weigh its result alongside memory, disk, and network evidence because the tools could be deceived.
- Plan remediation beyond a factory reset. Since CISA found root-level persistence could survive a reset, do not treat resetting the appliance as a clean bill of health. Determine whether a rebuild or replacement is needed based on the forensic findings and Ivanti’s guidance.
- Assume stored credentials may be exposed. The advisory urged defenders to assume user and service-account credentials stored on affected Ivanti appliances are likely compromised. Rotate affected credentials and investigate whether they were used to access other systems.
- Hunt for movement beyond the VPN. Look for signs of credential use, web shells, reverse tunnels, and other malicious activity in connected systems. If evidence indicates broader access, handle the event as an enterprise incident rather than an isolated appliance cleanup.
These choices address different risks: mitigation limits exposure, patching addresses the flaws, and forensics tests whether an attacker already established access. Appliance cleanup does not replace credential rotation or investigation of lateral movement.
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What the incident means for organizations
The January 2024 reporting showed how a flaw in a perimeter VPN could become a route to credentials and internal systems. The practical lesson is to treat suspected compromise as an incident spanning the appliance and the accounts and systems it could reach—not as a patch-and-reset task alone.
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