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Known exploited vulnerability

CVE-2023-20109

mediumCVSS 3.1 6.6In CISA KEVEPSS 2.5%Published · Cisco

The short answer

CVE-2023-20109 affects Cisco IOS and is rated medium (CVSS 6.6). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-10-10: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-787.

Severity

6.6 medium

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Oct 10, 2023

Federal due date Oct 31, 2023

EPSS, next 30 days

2.5%

Higher than 85% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected products

IOS, Cisco IOS XE Software. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-20109 being exploited?

Yes. CISA added CVE-2023-20109 to its Known Exploited Vulnerabilities catalog on 2023-10-10, with a federal remediation due date of 2023-10-31.

How do I fix CVE-2023-20109?

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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