← gociux.comall exploited CVEs

Exploited vulnerability · CISA KEV

Is CVE-2023-20109 exploited? Yes: in CISA KEV since 10 Oct 2023

Gociux · Cisco IOS and IOS XE · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-20109, Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Oct 2023, 13 days after it was published. It affects Cisco IOS and IOS XE, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 10 Oct 2023
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity6.6CVSS 3.1 · medium
US federal due31 Oct 2023BOD 22-01 deadline

What it is

Cisco IOS and IOS XE contain an out-of-bounds write vulnerability in the Group Encrypted Transport VPN (GET VPN) feature that could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute malicious code or cause a device to crash.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS and IOS XE
VulnerabilityCisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
WeaknessCWE-787
Published27 Sep 2023
Added to KEV10 Oct 2023
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS and IOS XE in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Sep 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS and IOS XE

References

Questions

Is CVE-2023-20109 being exploited?

Yes. CISA added CVE-2023-20109 to the Known Exploited Vulnerabilities catalog on 10 Oct 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-20109 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2023-20109?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected IOS and IOS XE and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2023 · Cisco scorecard · act-now radar.

Running Cisco in a regulated environment?

We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.

Get in touch →