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CVE-2020-12819

MEDIUM · CVSS 5.4EPSS 0.8%EU EUVD

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

Key facts

CVSS score
5.4 (v3.1)
Severity
MEDIUM
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Weakness (CWE)
CWE-122
EPSS score
0.8% (55th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2020-5102)
Published
December 19, 2024
NVD last modified
June 17, 2026
Status
Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2020-5102 in the EU Vulnerability Database. Last updated in EUVD on December 20, 2024.

View on the EU Vulnerability Database

Affected products

  • fortinet / fortios

Certified products that may be affected

4 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

  • FortiOS 5.6 - Fortinet, Inc. - FIPS 140 3639 - historical
  • FortiOS 5.2 - Fortinet, Inc. - FIPS 140 2765 - historical
  • FortiOS™ - Fortinet, Inc. - FIPS 140 1754 - historical
  • FortiOS - Fortinet, Inc. - FIPS 140 1431 - historical

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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