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CVE-2021-41691

42
FAUCET Score

CVE-2021-41691 is a critical SQL injection vulnerability (CWE-89) affecting OS4Ed Open Source Information System Community v8.0, specifically via the "student_id" and "TRANSFER{SCHOOL]" parameters in POST requests to /TransferredOutModal.php. With a CVSS score of 9.8 (CRITICAL), it allows unauthenticated attackers to achieve full compromise (confidentiality, integrity, availability) with low attack complexity. While not currently listed on CISA's KEV catalog, exploit code is available via Nuclei templates, and it has garnered significant community discussion, indicating potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:a:os4ed:opensis:8.0:*:*:*:community:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.72%
Probability of exploitation in next 30 days
EPSS Percentile
75.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-41691 · Mar 21, 2022
This CVE's current EPSS score of 0.0172 is in the 63rd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / OS4ED/openSIS-Classic
Product
opensis.com
Product
resources.s4e.io / blog/opensis-student-information-system-0-day-vulnerability-cve-2021-41691
Third Party Advisory