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CVE-2021-4242

24
FAUCET Score

CVE-2021-4242 is a critical OS command injection vulnerability affecting Sapido BR270n, BRC76n, GR297, and RB1732 devices, specifically within the ip/syscmd.htm functionality. This flaw allows for remote code execution with high impact on confidentiality, integrity, and availability, as reflected by its CVSS score of 8.8 (High). While public exploit code has been disclosed, there is no indication of active exploitation in the wild, nor significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.03CPE matchmatch criteria
cpe:2.3:o:sapido:br270n_firmware:2.1.03:*:*:*:*:*:*:*
2.1.03CPE matchmatch criteria
cpe:2.3:o:sapido:brc76n_firmware:2.1.03:*:*:*:*:*:*:*
2.1.3CPE matchmatch criteria
cpe:2.3:o:sapido:gr297n_firmware:2.1.3:*:*:*:*:*:*:*
2.0.43CPE matchmatch criteria
cpe:2.3:o:sapido:rb-1732_firmware:2.0.43:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.02%
Probability of exploitation in next 30 days
EPSS Percentile
86.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0302 is in the 85th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.csdn.net / qq_44159028/article/details/114590267
ExploitThird Party Advisory
github.com / smallpiggy/Sapido--rce/blob/main/Sapido%E8%B7%AF%E7%94%B1%E5%99%A8-rce.py
ExploitThird Party Advisory
vuldb.com
Third Party Advisory