Actively exploited · Published Sep 27, 2023 · Assigned by cisco
CVE-2023-20109
Medium 6.6 Exploited
In plain English
A medium-severity out-of-bounds write in Cisco IOS XE Software from Cisco. Attackers are actively exploiting it in the wild (listed by CISA on October 10, 2023). The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities). Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Oct 31, 2023.
Official description
A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute arbitrary code on an affected device or cause the device to crash. This vulnerability is due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols of the GET VPN feature. An attacker could exploit this vulnerability by either compromising an installed key server or modifying the configuration of a group member to point to a key server that is controlled by the attacker. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a denial of service (DoS) condition. For more information, see the Details ["#details"] section of this advisory.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | IOS | 12.4(24)T12.4(24)T312.4(22)T112.4(24)T512.4(24)T412.4(22)T12.4(24)T812.4(24)T2 |
| Cisco | Cisco IOS XE Software | 3.7.0S3.7.1S3.7.2S3.7.3S3.7.4S3.7.5S3.7.6S3.7.7S |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H