What is CVE-2021-1137?

CVE-2021-1137 is a high-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2021-04-08.

How severe is CVE-2021-1137?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Cisco Catalyst Sd-Wan Manager

CVE-2021-1137

Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute arbitrary code or allow an authenticated, local attacker to gain escalated privileges on an affected system. For more information about these vulnerabilities, see the Details section of this advisory.

Vulnerability class: Buffer Overflow

Published 2021-04-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vmanage-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1137?: CVE-2021-1137 is a high-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2021-04-08.
How severe is CVE-2021-1137?: High severity. CVSS v3 base score is 7.8 out of 10.