CVE-2020-12819

Published Dec 19, 2024 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Description
A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 and 6.4.1 and earlier may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel mode is enabled. Arbitrary code execution may be theoretically possible, albeit practically very difficult to achieve in this context

Remediation

Vendor Solution

Please upgrade to FortiOS versions 5.6.13 or above. Please upgrade to FortiOS versions 6.0.11 or above. Please upgrade to FortiOS versions 6.2.5 or above. Please upgrade to FortiOS versions 6.4.2 or above. Workaround: Disable tunnel mode.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2020-5102 A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 and 6.4.1 and earlier may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel mode is enabled. Arbitrary code execution may be theoretically possible, albeit practically very difficult to achieve in this context
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00175}

epss

{'score': 0.00221}

Type Values Removed Values Added
Weaknesses CWE-787
CPEs cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 and 6.4.1 and earlier may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel mode is enabled. Arbitrary code execution may be theoretically possible, albeit practically very difficult to achieve in this context
First Time appeared Fortinet
Fortinet fortios
Weaknesses CWE-122
CPEs cpe:2.3:o:fortinet:fortios:5.6.0:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.10:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.11:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.12:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.1:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.2:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.3:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.4:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.5:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.6:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.7:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.8:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:5.6.9:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.0:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.10:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.1:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.2:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.3:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.4:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.5:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.6:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.7:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.8:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.0.9:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.2.0:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.2.1:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.2.2:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.2.3:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.2.4:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.4.0:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:6.4.1:*:*:*:*:*:*:*
Vendors & Products Fortinet
Fortinet fortios
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:X/RC:X'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
fortinet
Published
Updated
Dec 20, 2024, 5:41 PM
Reserved
May 12, 2020, 12:00 AM
Status
Analyzed
Published
Dec 19, 2024, 8:15 AM
Modified
Jun 17, 2026, 2:52 AM