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ExploitedIn CISA KEV

CVE-2023-20109

Exploitation confirmed. First attested on 2023-10-10 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2023-09-27
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-09-2718:15CVE publishedNVD
  2. 2023-10-10Added to the CISA KEV catalogCISA KEV
  3. 2023-10-10Listed as exploited by GCVEGCVE
  4. 2023-10-10Exploitation first reportedCISA KEV
  5. 2024-10-2318:52SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-20109?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-20109?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ios
BranchAffectedFixed in
12.4= 12.4\(22\)mdno fix published
12.4= 12.4\(22\)md1no fix published
12.4= 12.4\(22\)md2no fix published
12.4= 12.4\(22\)mdano fix published
12.4= 12.4\(22\)mda1no fix published
12.4= 12.4\(22\)mda2no fix published
12.4= 12.4\(22\)mda3no fix published
12.4= 12.4\(22\)mda4no fix published
12.4= 12.4\(22\)mda5no fix published
12.4= 12.4\(22\)mda6no fix published
12.4= 12.4\(22\)tno fix published
12.4= 12.4\(22\)t1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As cisco, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Cisco IOS
    Affected
    • = 12.4(24)Tno fix stated
    • = 12.4(24)T3no fix stated
    • = 12.4(22)T1no fix stated
    • = 12.4(24)T5no fix stated
    • = 12.4(24)T4no fix stated
    • = 12.4(22)Tno fix stated
    • = 12.4(24)T8no fix stated
    • = 12.4(24)T2no fix stated

    666 more version lines in the CVE record.

  • Cisco IOS XE Software
    Affected
    • = 3.7.0Sno fix stated
    • = 3.7.1Sno fix stated
    • = 3.7.2Sno fix stated
    • = 3.7.3Sno fix stated
    • = 3.7.4Sno fix stated
    • = 3.7.5Sno fix stated
    • = 3.7.6Sno fix stated
    • = 3.7.7Sno fix stated

    356 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-01-25

Fix

  1. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2023-10-31

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-10-10
Patch Due Date
2023-10-31
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
2023-09-27
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-7h8h-8482-vvfh

Frequently asked questions

What is 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 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.

Is CVE-2023-20109 actively exploited?

Yes. CVE-2023-20109 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-10-31.

What is the CVSS score for CVE-2023-20109?

CVE-2023-20109 has a CVSS v3 base score of 6.6 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record