CVE-2021-37803Public exploitNetwork attack vector

Unauthenticated database compromise via unneutralized username

Published Oct 27, 2021 · Updated Aug 4, 2024

SQL injection in Sourcecodester Online Covid Vaccination Scheduler System 1.0 allows remote attackers to manipulate database queries. The lognin.php authentication handler incorporates the username parameter into an SQL statement without neutralizing SQL metacharacters. No authentication or user interaction is required; a crafted login request can read or alter application database records and disrupt database-backed operations.

CVSS severity8.1
High
EPSS probability1.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Sourcecodester Online Covid Vaccination Scheduler System 1.0 allows remote attackers to manipulate database queries. The lognin.php authentication handler incorporates the username parameter into an SQL statement without neutralizing SQL metacharacters. No authentication or user interaction is required; a crafted login request can read or alter application database records and disrupt database-backed operations.

The record

CVE
CVE-2021-37803
Published
Oct 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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