CVE-2020-7461

highpriority · track · 40stack campaign · NAME:WRECKEPSS 0.041 · 91 %ileexploit · PoCDEEURUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
2 exploits · PoC
Likely / severe?
4.13% (91st) EPSS
CVSS 7.5 · high
Is it mine?
17 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

In FreeBSD 12.1-STABLE before r365010, 11.4-STABLE before r365011, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, dhclient(8) fails to handle certain malformed input related to handling of DHCP option 119 resulting a heap overflow. The heap overflow could in principle be exploited to achieve remote code execution. The affected process runs with reduced privileges in a Capsicum sandbox, limiting the immediate impact of an exploit.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

  • MitigationSIMATIC RF350Msiemens_psirt

    Use trusted DNS servers in internal network, and restrict DNS traffic to this network only through firewalls.

  • MitigationSIMATIC RF650Msiemens_psirt

    Use trusted DNS servers in internal network, and restrict DNS traffic to this network only through firewalls.

  • MitigationSIMATIC RF350Mcisa_csaf_ot

    Use trusted DNS servers in internal network, and restrict DNS traffic to this network only through firewalls.

  • MitigationSIMATIC RF650Mcisa_csaf_ot

    Use trusted DNS servers in internal network, and restrict DNS traffic to this network only through firewalls.

  • WorkaroundSIMATIC RF350Msiemens_psirt

    Protect network access to affected devices.

  • WorkaroundSIMATIC RF650Msiemens_psirt

    Protect network access to affected devices.

  • WorkaroundSIMATIC RF350Mcisa_csaf_ot

    Protect network access to affected devices.

  • WorkaroundSIMATIC RF650Mcisa_csaf_ot

    Protect network access to affected devices.

  • No fix availableSIMATIC RF350Msiemens_psirt

    Currently no remediation is available

  • No fix availableSIMATIC RF650Msiemens_psirt

    Currently no remediation is available

  • No fix availableSIMATIC RF350Mcisa_csaf_ot

    Currently no remediation is available

  • No fix availableSIMATIC RF650Mcisa_csaf_ot

    Currently no remediation is available

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4
v3.17.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 3.4
v3.17.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:Csecondary · CISA US
v3.17.3highAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · FSTEC (BDU) RU
v3.17.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:Csecondary · Siemens ProductCERT DE
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:Psecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-787USCWE-787USCWE-787US
04

exploits (2)

Public proof-of-concept and weaponised exploit code.

05

affected products (17)

Products and version ranges known to be affected.

06

advisories (2)

Vendor and ecosystem advisories describing this.

  • SSA-288459SSA-288459: Heap Overflow Vulnerability in RFID terminals2021-09-14csaf · siemens_psirtDE

    A heap overflow vulnerability in dhclient of the affected products, which has been published alongside other vulnerabilities as part of NAME:WRECK could allow an attacker to potentially remotely execute code. Siemens recommends specific countermeasures for products.

  • ICSA-21-257-11Siemens SIMATIC RFID2021-09-14icsa · cisa_csaf_otUS

    A heap overflow vulnerability in dhclient of the affected products, which has been published alongside other vulnerabilities as part of NAME:WRECK could allow an attacker to potentially remotely execute code. Siemens recommends specific countermeasures for products.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisa_csaf_otnvdsiemens_psirtNVDCVE.orgMITRE
published 2021-03-26modified 2026-06-17
10

references (11)

External citations — patches, advisories, analysis.

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