Denial of service in Cisco IOS and IOS XE Software
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-34703 |
| CWE-ID | CWE-456 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Cisco IOS Operating systems & Components / Operating system Cisco IOS XE Operating systems & Components / Operating system |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Missing Initialization of a Variable
EUVDB-ID: #VU56864
Risk: Low
CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-34703
CWE-ID:
CWE-456 - Missing Initialization of a Variable
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper initialization of a buffer in the Link Layer Discovery Protocol (LLDP) message parser. A remote authenticated attacker on the local network can trigger a reload of an affected device and cause a denial of service condition on the target system
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco IOS: 16.12.3
Cisco IOS XE: 16.12.3
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
