CVE-2021-1511 json
Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities
published 2021-05-06 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-6978
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Patch / fix
- cisco vedge_100_firmware 20.4.1, 20.5.1
- cisco vedge_1000_firmware 20.4.1, 20.5.1
- cisco vedge_100b_firmware 20.4.1, 20.5.1
- cisco vedge_100m_firmware 20.4.1, 20.5.1
- cisco vedge_100wm_firmware 20.4.1, 20.5.1
- cisco vedge_2000_firmware 20.4.1, 20.5.1
- cisco vedge_5000_firmware 20.4.1, 20.5.1
- cisco vedge_cloud_firmware 20.4.1, 20.5.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:L/Au:S/C:N/I:N/A:C |
Affected products
- Cisco Cisco SD-WAN vEdge router
Classification
- Weakness
-
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
Sources
- CVE List CVE-2021-1511
- NVD CVE-2021-1511
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.