CVE-2020-3284
No exploitation reported by the sources we read.
- Published2020-11-06
- Fixed in7.2.1 · 7.0.2 · 6.6.25 · 6.5.2 · 1.21 · 1.12
- WeaknessCWE-284
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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 enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE boot process on an affected device. The PXE boot loader is part of the BIOS and runs over the management interface of hardware platforms that are running Cisco IOS XR Software only. The vulnerability exists because internal commands that are issued when the PXE network boot process is loading a software image are not properly verified. An attacker could exploit this vulnerability by compromising the PXE boot server and replacing a valid software image with a malicious one. Alternatively, the attacker could impersonate the PXE boot server and send a PXE boot reply with a malicious file. A successful exploit could allow the attacker to execute unsigned code on the affected device. Note: To fix this vulnerability, both the Cisco IOS XR Software and the BIOS must be upgraded. The BIOS code is included in Cisco IOS XR Software but might require additional installation steps. For further information, see the Fixed Software section of this advisory.
Timeline
dates in UTC- 2020-11-0619:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-3284?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3284?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.2 | < 7.2.1 | 7.2.1 | NVD |
| 7.0 | ≥ 7.0.0, < 7.0.2 | 7.0.2 | NVD |
| 6.6 | < 6.6.25 | 6.6.25 | NVD |
| 6.5 | < 6.5.2 | 6.5.2 | NVD |
| 1.21 | < 1.21 | 1.21 | NVD |
| 1.12 | < 1.12 | 1.12 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 14.35 | < 14.35 | 14.35 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 14.35 | < 14.35 | 14.35 | NVD |
41 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco ios xr to 7.2.1 · 7.0.2 · 6.6.25 · 6.5.2 · 1.21 · 1.12
Advisories and patches
- tools.cisco.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2020-11-06
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-3284?
Is CVE-2020-3284 actively exploited?
What is the CVSS score for CVE-2020-3284?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
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