Denial of service in Cisco IOS XE Software RESTCONF and NETCONF-YANG Access Control List
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-3407 |
| CWE-ID | CWE-476 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Cisco IOS Operating systems & Components / Operating system Cisco IOS XR Operating systems & Components / Operating system Cisco NX-OS Operating systems & Components / Operating system |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) NULL pointer dereference
EUVDB-ID: #VU47109
Risk: High
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2020-3407
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error n the RESTCONF and NETCONF-YANG access control list (ACL) function of Cisco IOS XE Software c. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco IOS: 16.12.1 - 16.12.2
Cisco IOS XR: All versions
Cisco NX-OS: All versions
CPE2.3- cpe:2.3:o:cisco_systems:cisco_ios:16.12.2:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_nx-os:*:*:*:*:*:*:*:*
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-confacl-HbPtfSuO
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
