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CVE-2021-33186

24
FAUCET Score

CVE-2021-33186 is a high-severity stack buffer overflow vulnerability in SerenityOS, specifically within the test-crypto.cpp component. This flaw allows unauthenticated attackers to remotely obtain sensitive information without user interaction. While the CVSS score is 7.5, indicating a significant risk, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:serenityos:serenityos:-:*:*:*:*:*:*:*

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
1.02%
Probability of exploitation in next 30 days
EPSS Percentile
59.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0102 is in the 36th percentile among its peer group of 51,485 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

github.com / SerenityOS/serenity/issues/7072
Third Party Advisory