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Fencer Vulns
medium 5.3

CVE-2021-1473 json

Cisco Small Business RV Series Routers Vulnerabilities

published 2021-04-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-6940

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
64.4%
EPSS 64.4% chance of exploitation in 30 days, percentile 99.2%
public exploits
1
Metasploit

Summary

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.

Patch / fix

  • cisco rv340_firmware 1.0.03.21
  • cisco rv340w_firmware 1.0.03.21
  • cisco rv345_firmware 1.0.03.21
  • cisco rv345p_firmware 1.0.03.21

Timeline

  1. First public exploit (Metasploit exploit/linux/http/cisco_rv_series_authbypass_and_rce)
  2. Published

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

64.41% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Cisco Cisco Small Business RV Series Router Firmware

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

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.