Denial of service in Cisco IOS and IOS XE Software
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-34699 |
| CWE-ID | CWE-435 |
| Exploitation vector | 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 medium risk vulnerability.
1) Improper Interaction Between Multiple Correctly-Behaving Entities
EUVDB-ID: #VU56873
Risk: Medium
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-34699
CWE-ID:
CWE-435 - Improper Interaction Between Multiple Correctly-Behaving Entities
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an improper interaction between the web UI and the CLI parser. A remote authenticated attacker can request a particular CLI command to be run through the web UI and cause a denial of service condition on the target system.
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco IOS: 16.12.3 - 17.3.2
Cisco IOS XE: 16.12.3 - 17.3.2
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-trustsec-dos-7fuXDR2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
