CVE-2021-27861: CISCO
CISCO, IOS
CVE-2021-27861
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length(and optionally VLAN0 headers)
True
False
You can find more insights and intelligence on this CVE at: https://vi.loginsoft.com/app/cve/CVE-2021-27861
To ascertain the vulnerable conditions and product versions deemed affected, issue the following commands and look for its associated as stated. If one more conditions matches then we can consider it as affected.
show version
Cisco IOS Software
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WS-C65[0-9]{2}
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WS-C68[0-9]{2}
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WS-C3650-[0-9]{1,2}
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WS-C3850-[0-9]{2}
show version
C9200[d]
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C9300[d]
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C9400[d]
show version
C9500[d]
show version
C9600[d]
15.5(01.01.85)SY07
15.2(07)E02
https://standards.ieee.org/ieee/802.1Q/10323/
https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
https://standards.ieee.org/ieee/802.2/1048/
https://blog.champtar.fr/VLAN0_LLC_SNAP/
https://kb.cert.org/vuls/id/855201
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