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CVE-2021-21005

HIGH
Published 2021-06-25T18:25:53.099513Z
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CVSS Score

V3.1
7.5
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.125
Higher than 12.5% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Description

In Phoenix Contact FL SWITCH SMCS series products in multiple versions if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Phoenix Contact

FL SWITCH

Affected Versions:

SMCS 16TX (2700996) SMCS 14TX/2FX (2700997) SMCS 14TX/2FX-SM (2701466) SMCS 8GT (2891123) SMCS 6GT/2SFP (2891479) SMCS 8TX-PN (2989103) SMCS 4TX-PN (2989093) SMCS 8TX (2989226) SMCS 6TX/2SFP (2989323) SMN 6TX/2POF-PN (2700290) SMN 8TX-PN (2989501) SMN 6TX/2FX (2989543) SMN 6TX/2FX SM (2989556)
Phoenix Contact

FL NAT

Affected Versions:

SMN 8TX (2989365) SMN 8TX-M (2702443)

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-jmcx-w32h-8qj4

Advisory Details

In Phoenix Contact FL SWITCH SMCS series products in multiple versions if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.

CVSS Scoring

CVSS Score

7.5

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-21005
WEB https://cert.vde.com/en-us/advisories/vde-2021-023

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: May 24, 2022

References

https://cert.vde.com/en-us/advisories/vde-2021-023
Published: 2021-06-25T18:25:53.099513Z
Last Modified: 2024-09-17T02:17:13.899Z
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