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CVE-2021-40857

29
FAUCET Score

CVE-2021-40857 describes a privilege escalation vulnerability affecting Auerswald COMpact 5500R devices running firmware versions prior to 8.2B. An authenticated attacker can exploit this flaw by including "passwd=1" in a request, gaining elevated privileges. With a CVSS score of 8.8 (High), this vulnerability poses a significant risk due to its low attack complexity and potential for complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or Metasploit/Nuclei modules, the vulnerability has garnered minimal community discussion, with only one mention identified.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.0bCPE matchmatch criteria
cpe:2.3:o:auerswald:compact_5500r_ip_firmware:*:*:*:*:*:*:*:*
<= 8.0bCPE matchmatch criteria
cpe:2.3:o:auerswald:compact_5200r_ip_firmware:*:*:*:*:*:*:*:*
<= 8.0bCPE matchmatch criteria
cpe:2.3:o:auerswald:compact_5000r_ip_firmware:*:*:*:*:*:*:*:*
<= 8.0bCPE matchmatch criteria
cpe:2.3:o:auerswald:compact_4000_ip_firmware:*:*:*:*:*:*:*:*
<= 8.0bCPE matchmatch criteria
cpe:2.3:o:auerswald:commander_6000r_ip_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 77th percentile among its peer group of 17,844 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

packetstormsecurity.com / files/165163/Auerswald-COMpact-8.0B-Privilege-Escalation.html
ExploitThird Party AdvisoryVDB Entry
redteam-pentesting.de / advisories/rt-sa-2021-005
ExploitThird Party Advisory
redteam-pentesting.de / en/advisories/-advisories-publicised-vulnerability-analyses
ExploitThird Party Advisory