CVE-2021-27316Public exploitNetwork attack vector

Database disclosure via unsanitized lastname query

Published Mar 24, 2021 · Updated Aug 3, 2024

Blind SQL injection in Doctor Appointment System 1.0 allows remote attackers to read database data through the contact form's lastname parameter. contactus.php incorporates the submitted lastname value into a database query without neutralizing SQL syntax, enabling blind inference through response behavior. No authentication or user interaction is required, and the published impact is limited to database confidentiality.

CVSS severity7.5
High
EPSS probability7.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SQL injection in Doctor Appointment System 1.0 allows remote attackers to read database data through the contact form's lastname parameter. contactus.php incorporates the submitted lastname value into a database query without neutralizing SQL syntax, enabling blind inference through response behavior. No authentication or user interaction is required, and the published impact is limited to database confidentiality.

The record

CVE
CVE-2021-27316
Published
Mar 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

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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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