How severe is CVE-2021-21919?

CVE-2021-21919 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-21919 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21919?

CVE-2021-21919 affects Advantech R-seenet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21919?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21919 published?

CVE-2021-21919 was published on 2021-12-22 and last updated on 2026-06-17.

CVE-2021-21919

CVE-2021-21919 is a medium-severity vulnerability in Advantech R-seenet with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Advantech R-seenet
Published: 2021-12-22
Last modified: 2026-06-17

Description

A specially-crafted HTTP request can lead to SQL injection. An attacker can make authenticated HTTP requests to trigger this vulnerability at ord’ parameter. However, the high privilege super-administrator account needs to be used to achieve exploitation without cross-site request forgery attack.

Frequently asked questions

What is CVE-2021-21919?: A specially-crafted HTTP request can lead to SQL injection. An attacker can make authenticated HTTP requests to trigger this vulnerability at ord’ parameter. However, the high privilege super-administrator account needs to be used to achieve exploitation without cross-site request forgery attack.
How severe is CVE-2021-21919?: CVE-2021-21919 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-21919 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21919?: CVE-2021-21919 affects Advantech R-seenet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21919?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21919 published?: CVE-2021-21919 was published on 2021-12-22 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1364

Affected products (1)

cpe:2.3:a:advantech:r-seenet:2.4.15:*:*:*:*:*:*:*

More vulnerabilities in Advantech R-seenet

CVE-2023-5642 — Critical (CVSS 9.8): Advantech R-SeeNet v2.4.23 allows an unauthenticated remote attacker to read from and write to the snmpmon.ini file,…
CVE-2023-2611 — Critical (CVSS 9.8): Advantech R-SeeNet versions 2.4.22 is installed with a hidden root-level user that is not available in the users…
CVE-2022-3386 — Critical (CVSS 9.8): Advantech R-SeeNet Versions 2.4.17 and prior are vulnerable to a stack-based buffer overflow. An unauthorized attacker…
CVE-2022-3385 — Critical (CVSS 9.8): Advantech R-SeeNet Versions 2.4.17 and prior are vulnerable to a stack-based buffer overflow. An unauthorized attacker…
CVE-2021-21805 — Critical (CVSS 9.8): An OS Command Injection vulnerability exists in the ping.php script functionality of Advantech R-SeeNet v 2.4.12…
CVE-2021-21804 — Critical (CVSS 9.8): A local file inclusion (LFI) vulnerability exists in the options.php script functionality of Advantech R-SeeNet v…

All CVEs affecting Advantech R-seenet →

Other CWE-89 (SQL Injection) vulnerabilities

CVE-2026-54350 — Critical (CVSS 10.0): Budibase is an open-source low-code platform. Prior to 3.39.12, an unauthenticated visitor of any published Budibase…
CVE-2026-8054 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in the Publish Audit API endpoints…
CVE-2026-42287 — Critical (CVSS 10.0): Emlog is an open source website building system. Prior to version 2.6.11, direct SQL injection in article creation and…
CVE-2026-3325 — Critical (CVSS 10.0): SQL injection (SQLi) in MegaCMS v12.0.0, specifically in the “id_territorio” parameter of the…
CVE-2025-10878 — Critical (CVSS 10.0): A SQL injection vulnerability exists in the login functionality of Fikir Odalari AdminPando 1.0.1 before 2026-01-26.…
CVE-2025-57792 — Critical (CVSS 10.0): Explorance Blue versions prior to 8.14.9 contain a SQL injection vulnerability caused by insufficient validation of…

Browse all CWE-89 (SQL Injection) vulnerabilities →