Weakness / #30
CWE-121: Stack-based buffer overflow in CISA KEV
Stack-based Buffer Overflow
Answer 12 KEV entries list CWE-121 (Stack-based buffer overflow) as of catalog 2026.09.23, 0.7% of the catalog and rank 30 of 185 weaknesses. The most affected vendor is Cisco (4).
- KEV entries
- 120.7% of catalog
- Vendors
- 8affected
- Ransomware: known
- 325%
- First added
- 2021-11-03
- Latest added
- 2026-09-21
VVendors
TAdditions by year
| Year | Added |
|---|---|
| 2021 | 1 |
| 2022 | 4 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 4 |
| 2026 | 3 |
PProducts
| Product | Entries | Share |
|---|---|---|
| Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers | 3 | 25% |
| Ivanti Connect Secure, Policy Secure, and ZTA Gateways | 2 | 16.7% |
| Zyxel GS1900 Series Switches | 1 | 8.3% |
| DD-WRT DD-WRT | 1 | 8.3% |
| F5 BIG-IP | 1 | 8.3% |
| Cisco IOS and IOS XE | 1 | 8.3% |
| Qualitia Active! Mail | 1 | 8.3% |
| SonicWall SMA 100 Appliances | 1 | 8.3% |
EAll entries
| CVE | Vendor | Product | Added | Ransomware |
|---|---|---|---|---|
| CVE-2026-7273 | Zyxel | GS1900 Series Switches | New | Unknown |
| CVE-2021-27137 | DD-WRT | DD-WRT | Unknown | |
| CVE-2025-53521 | F5 | BIG-IP | Unknown | |
| CVE-2025-20352 | Cisco | IOS and IOS XE | Unknown | |
| CVE-2025-42599 | Qualitia | Active! Mail | Unknown | |
| CVE-2025-22457 | Ivanti | Connect Secure, Policy Secure, and ZTA Gateways | Known | |
| CVE-2025-0282 | Ivanti | Connect Secure, Policy Secure, and ZTA Gateways | Known | |
| CVE-2022-20708 | Cisco | Small Business RV160, RV260, RV340, and RV345 Series Routers | Unknown | |
| CVE-2022-20701 | Cisco | Small Business RV160, RV260, RV340, and RV345 Series Routers | Unknown | |
| CVE-2022-20700 | Cisco | Small Business RV160, RV260, RV340, and RV345 Series Routers | Unknown | |
| CVE-2021-20038 | SonicWall | SMA 100 Appliances | Known | |
| CVE-2020-5735 | Amcrest | Cameras and Network Video Recorder (NVR) | Unknown |
Cite this
12 CISA KEV entries list CWE-121 (Stack-based buffer overflow), 0.7% of the catalog. Source: Telemetry analysis of the CISA Known Exploited Vulnerabilities catalog, version 2026.09.23 (released 2026-09-23). https://glide-telemetry.pages.dev/cwe/cwe-121/
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.