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CVE-2021-42755

MEDIUMCVSS 4.3/10EPSS 0.36%

Last modified

CVE-2021-42755 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An integer overflow / wraparound vulnerability [CWE-190] in FortiSwitch 7.0.2 and below, 6.4.9 and below, 6.2.x, 6.0.x; FortiRecorder 6.4.2 and below, 6.0.10 and below; FortiOS 7.0.2 and below, 6.4.8 and below, 6.2.10 and below, 6.0.x; FortiProxy 7.0.0, 2.0.6 and below, 1.2.x, 1.1.x, 1.0.x; FortiVoiceEnterprise 6.4.3 and below, 6.0.10 and below dhcpd daemon may allow an unauthenticated and network adjacent attacker to crash the dhcpd deamon, resulting in potential denial of service.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

An integer overflow / wraparound vulnerability [CWE-190] in FortiSwitch 7.0.2 and below, 6.4.9 and below, 6.2.x, 6.0.x; FortiRecorder 6.4.2 and below, 6.0.10 and below; FortiOS 7.0.2 and below, 6.4.8 and below, 6.2.10 and below, 6.0.x; FortiProxy 7.0.0, 2.0.6 and below, 1.2.x, 1.1.x, 1.0.x; FortiVoiceEnterprise 6.4.3 and below, 6.0.10 and below dhcpd daemon may allow an unauthenticated and network adjacent attacker to crash the dhcpd deamon, resulting in potential denial of service.

Metrics

CVSS 3.1
4.3/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Probability
0.36%

28.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
FortinetFortiproxy>= 1.0.0, <= 1.0.7
FortinetFortiproxy>= 1.1.0, <= 1.1.6
FortinetFortiproxy>= 1.2.0, <= 1.2.13
FortinetFortiproxy>= 2.0.0, <= 2.0.6
FortinetFortiproxy7.0.0
FortinetFortivoice5.3.0
FortinetFortivoice5.3.1
FortinetFortivoice5.3.2
FortinetFortivoice5.3.3
FortinetFortivoice5.3.4
FortinetFortivoice5.3.5
FortinetFortivoice5.3.6
FortinetFortivoice5.3.7
FortinetFortivoice5.3.8
FortinetFortivoice5.3.10
FortinetFortivoice5.3.11
FortinetFortivoice5.3.12
FortinetFortivoice5.3.13
FortinetFortivoice5.3.14
FortinetFortivoice5.3.15
FortinetFortivoice5.3.16
FortinetFortivoice5.3.17
FortinetFortivoice5.3.18
FortinetFortivoice5.3.19
FortinetFortivoice5.3.20
FortinetFortivoice5.3.21
FortinetFortivoice5.3.22
FortinetFortivoice5.3.23
FortinetFortivoice5.3.24
FortinetFortivoice5.3.25
FortinetFortivoice5.3.26
FortinetFortivoice6.0.0
FortinetFortivoice6.0.1
FortinetFortivoice6.0.2
FortinetFortivoice6.0.3
FortinetFortivoice6.0.4
FortinetFortivoice6.0.5
FortinetFortivoice6.0.6
FortinetFortivoice6.0.7
FortinetFortivoice6.0.8
FortinetFortivoice6.0.9
FortinetFortivoice6.0.10
FortinetFortivoice6.4.0
FortinetFortivoice6.4.1
FortinetFortivoice6.4.2
FortinetFortivoice6.4.3
FortinetFortios5.4.0
FortinetFortios5.4.1
FortinetFortios5.4.2
FortinetFortios5.4.3

Showing 50 of 130 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-42755?
An integer overflow / wraparound vulnerability [CWE-190] in FortiSwitch 7.0.2 and below, 6.4.9 and below, 6.2.x, 6.0.x; FortiRecorder 6.4.2 and below, 6.0.10 and below; FortiOS 7.0.2 and below, 6.4.8 and below, 6.2.10 and below, 6.0.x; FortiProxy 7.0.0, 2.0.6 and below, 1.2.x, 1.1.x, 1.0.x; FortiVoiceEnterprise 6.4.3 and below, 6.0.10 and below dhcpd daemon may allow an unauthenticated and network adjacent attacker to crash the dhcpd deamon, resulting in potential denial of service.
How severe is CVE-2021-42755?
CVE-2021-42755 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42755?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42755?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST