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CVE-2021-3523

25
FAUCET Score

CVE-2021-3523 is a high-severity flaw in Red Hat 3Scale APICast versions prior to 2.11.0, where incorrect connection reuse could allow attackers to bypass API security restrictions. This vulnerability, with a CVSS score of 7.5, has a network attack vector and low attack complexity, potentially leading to high integrity impacts without requiring user interaction or privileges. While the EPSS score is low, indicating a low likelihood of exploitation, there is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.11.0CPE matchmatch criteria
cpe:2.3:a:redhat:apicast:*:*:*:*:*:*:*:*

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:N/I:H/A:N

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

Exploit Intelligence

EPSS Score
0.82%
Probability of exploitation in next 30 days
EPSS Percentile
53.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0082 is in the 29th percentile among its peer group of 51,551 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

Vendor Patches (1)

redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2021-3523Moderate

apicast: permits auth bypass with connection reuse

Apr 26, 2022

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory