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CVE-2021-43098

23
FAUCET Score

CVE-2021-43098 describes a critical file upload vulnerability in diyhi bbs v5.3, specifically within the getType function of QuestionManageAction.java. This flaw allows a highly privileged attacker to upload arbitrary files, leading to a complete compromise of confidentiality, integrity, and availability, as indicated by its CVSS score of 7.2 (High). Despite its severity, there is currently no public exploit code available, nor is it listed on the CISA KEV catalog, suggesting it is not actively exploited in the wild. Community discussion and media coverage for this CVE are also minimal.

Impacted Technologies

VendorProductVersion(s)CPE
5.3CPE matchmatch criteria
cpe:2.3:a:diyhi:bbs:5.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 55th percentile among its peer group of 5,531 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 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 / diyhi/bbs/issues/51
ExploitThird Party Advisory