CVE-2021-21704

Multiple vulnerabilities in Firebird client extension

MEDIUM
5.9
CVSS Score
Published: October 4, 2021 at 04:00 AM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 2 vendorsPHPClustered Data ONTAP

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Severity
MEDIUM5.9
Exploit prediction
EPSS 2%

Description

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using Firebird PDO driver extension, a malicious database server could cause crashes in various database functions, such as getAttribute(), execute(), fetch() and others by returning invalid response data that is not parsed correctly by the driver. This can result in crashes, denial of service or potentially memory corruption.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP· PHPdrupal
95%
7.3.0 ≤ v < 7.3.297.3.x ≤ v < 7.3.297.4.0 ≤ v < 7.4.217.4.x ≤ v < 7.4.218.0.0 ≤ v < 8.0.88.0.X ≤ v < 8.0.87.3.x7.4.x8.0.X
Affected range stops below 7.3.29, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (6)

x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
https://bugs.php.net/bug.php?id=76448
x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
https://bugs.php.net/bug.php?id=76449
x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
https://bugs.php.net/bug.php?id=76450
x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
https://bugs.php.net/bug.php?id=76452
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/202209-20

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125CWE-190CWE-787

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