FortiOS SSL-VPN heap overflow enables unauthenticated remote code execution
FortiOS SSL-VPN contains a heap-based buffer overflow vulnerability (CVE-2022-42475) enabling unauthenticated remote code execution; active exploitation observed.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2022-42475 as exploited in the wild.
Japan's IPA has issued an alert regarding a critical heap-based buffer overflow vulnerability in FortiOS SSL-VPN, a remote access VPN product. The vulnerability allows unauthenticated remote attackers to send crafted requests that can result in arbitrary code or command execution on affected systems. Active exploitation of this vulnerability has been confirmed in the wild, prompting urgent calls for immediate patching.
Fortinet has released updated versions to address the vulnerability, and organizations are strongly advised to apply these patches immediately. For systems that cannot be immediately updated, the vendor has provided workaround measures to mitigate the risk. IPA recommends that product users investigate their systems for potential compromise and follow the guidance provided by Fortinet.
Given the combination of no authentication requirement, remote exploitability, arbitrary code execution potential, and confirmed active exploitation, this represents a severe threat to organizations running vulnerable FortiOS SSL-VPN instances. The risk of widespread impact is high, particularly as VPN appliances are commonly exposed to the internet.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/archive/security/security-alert/2022/alert20221213.html
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