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CVE-2021-42016

24
FAUCET Score

CVE-2021-42016 is a timing attack vulnerability in a third-party component affecting numerous Siemens RUGGEDCOM products. This flaw could allow an unauthenticated attacker to retrieve the private key used for encrypting sensitive data. Rated with a CVSS score of 7.5 (HIGH), the vulnerability has a low attack complexity and could lead to a complete compromise of data confidentiality. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:siemens:ruggedcom_ros:*:*:*:*:*:*:*:*
< 5.6.0CPE matchmatch criteria
cpe:2.3:o:siemens:ruggedcom_ros:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
45.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 23rd percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

cert-portal.siemens.com / productcert/html/ssa-256353.html
cert-portal.siemens.com / productcert/pdf/ssa-256353.pdf
PatchVendor Advisory