What is CVE-2023-20109?

CVE-2023-20109 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under Out-of-bounds Write. CVSS score: 6.6/10. Published 2023-09-27.

How severe is CVE-2023-20109?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Is CVE-2023-20109 known to be exploited?

Yes. CVE-2023-20109 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Buffer overflow in Cisco Ios Xe Software

CVE-2023-20109

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 ser…

Vulnerability class: Buffer Overflow

EPSS: 0.006 (70.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisco Ios Xe Software — versions 3.7.0S, 3.7.1S, 3.7.2S
Cisco Ios — versions 12.4(24)T, 12.4(24)T3, 12.4(22)T1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-10-10. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-10-31.

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

Public proof-of-concept exploits

References

cisco-sa-getvpn-rce-g8qR68sx

Frequently asked questions

What is CVE-2023-20109?: CVE-2023-20109 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under Out-of-bounds Write. CVSS score: 6.6/10. Published 2023-09-27.
How severe is CVE-2023-20109?: Medium severity. CVSS v3 base score is 6.6 out of 10.
Is CVE-2023-20109 known to be exploited?: Yes. CVE-2023-20109 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.