CVE-2021-1472
Confirmed PUBLISHEDCisco Small Business RV Series Routers Vulnerabilities
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
Multiple vulnerabilities exist in the web-based management interface of Cisco Small Business RV Series Routers. A remote attacker could execute arbitrary commands or bypass authentication and upload files on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
- CVE Published
- Apr 08, 2021
- Exploitation Reported
- Jul 03, 2026
- CVSS
- 5.3 Medium
- EPSS
- 72.5%
CVE References
- 20210407 Cisco Small Business RV Series Routers Vulnerabilities tools.cisco.com · Vendor Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory...
- 20210419 [CVE-2021-1472/CVE-2021-1473] Cisco RV Series Authentication Bypass and Remote Command Execution seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Apr/39
- packetstormsecurity.com/files/162238/Cisco-RV-Authentication-Bypass-... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/162238/Cisco-RV-Authentication-B...
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| KEVIntel First | 2026-07-30 15:50 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 11
- Unique Attacker IPs
- 8
- Attacker Countries
- 🇩🇪 🇪🇪 🇯🇵 🇳🇱 🇺🇸 🇻🇳
- Sensors Observed
- 6
Exploitation Attempts Over the Last 29 Days
First observed (all time) 2026-07-03 04:21 UTC · Last observed 2026-07-30 15:25 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request paths
- 1
- Distinct User-Agents
- 10
The specific request paths and User-Agents attackers are using are available on Pro and Enterprise plans.
Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/cisco_rv_series_authbypass_and_rce.rb | Apr 28, 2025 |
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-1472.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AV:N/AC:L/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2026-07-03 04:21:18 UTC · KEVIntel
Active exploitation observed
Recorded 2026-07-03 04:21:18 UTC · KEVIntel sensor
Proof of concept available
Recorded 2026-06-12 14:20:18 UTC · Nuclei Templates
Weaknesses (CWE)
-
Improper Restriction of Operations within the Bounds of a Memory Buffer
-
Improper Authentication
Scanner Integrations
Nuclei, Metasploit, and other scanner references for this CVE are listed on the Detection tab.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
04:21 UTC 28 days ago04:21 UTC · 28 days ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
04:21 UTC 28 days ago04:21 UTC · 28 days ago
Indicators of compromise added (8)
Indicators of compromise recorded
-
14:20 UTC about 2 months ago14:20 UTC · about 2 months ago
Public PoC available
Public proof-of-concept code published
-
15:02 UTC over 1 year ago15:02 UTC · over 1 year ago
Metasploit module available
Exploit module available
-
00:00 UTC over 1 year ago00:00 UTC · over 1 year ago
Nuclei template available
Scanner coverage available
-
04:06 UTC over 5 years ago04:06 UTC · over 5 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-1472
{
"cve_id": "CVE-2021-1472",
"title": "Cisco Small Business RV Series Routers Vulnerabilities",
"affected_vendor": "Cisco",
"affected_product": "Cisco Small Business RV Series Router Firmware",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 5.3,
"epss_score": 0.72472,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}