A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below,
Affects the SSL-VPN component of FortiOS 7.2.0-7.2.4, 7.0.0-7.0.11, 6.4.0-6.4.12, 6.2.0-6.2.13 and 6.0.0-6.0.16, and of FortiProxy. Fixed by upgrading FortiOS to 7.2.5 or above.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The vulnerability affects Fortinet's FortiOS and FortiProxy operating systems, specifically their SSL-VPN components. A remote attacker could exploit it by sending specially crafted requests, potentially gaining the ability to run arbitrary code or commands on the affected device.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Fortinet FortiOS-6K7K
From 6.2.9 · through 6.2.13; From 6.2.6 · through 6.2.7; From 6.0.12 · through 6.0.16
- Fortinet FortiProxy
From 7.2.0 · through 7.2.3; From 7.0.0 · through 7.0.9; From 2.0.0 · through 2.0.12; From 1.2.0 · through 1.2.13; From 1.1.0 · through 1.1.6
- Fortinet FortiOS
From 7.2.0 · through 7.2.4; From 7.0.0 · through 7.0.11; From 6.4.0 · through 6.4.12; From 6.2.0 · through 6.2.13; From 6.0.0 · through 6.0.16
References 1
fortiguard.com
Questions about CVE-2023-27997
What does this mean?
The flaw is a heap-based buffer overflow in the SSL-VPN component. A remote attacker may be able to execute arbitrary code or commands by sending specifically crafted requests.Source: fortiguard.com
Am I affected, and how do I check?
FortiOS 7.2.0 through 7.2.4, 7.0.0 through 7.0.11, 6.4.0 through 6.4.12, 6.2.0 through 6.2.13 and 6.0.0 through 6.0.16 are listed as affected, as are FortiProxy 7.2.0 through 7.2.3, 7.0.0 through 7.0.9, 2.0.0 through 2.0.12, and 1.2 and 1.1 all versions. The issue is in SSL-VPN, so check whether SSL-VPN is in use and compare the installed version with these ranges.Source: fortiguard.com
What should I do about it?
Upgrade FortiOS to 7.2.5 or above, as stated in the advisory.Source: fortiguard.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2023-06-13, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The workaround given is to disable SSL-VPN until a fixed version can be installed.Source: fortiguard.com