CVE-2021-21704: medium-severity vulnerability in PHP
Multiple vulnerabilities in Firebird client extension
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5epss 1.8%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Affected products
PHP Group · PHPRelated CVEs — PHP
In the same product, most dangerous first.
CVE-2026-109619CRITICALRCE via stale global stateEPSS 100.0%KEVCVE-2026-109618CRITICALRCE via OOM corruptionEPSS 100.0%KEVCVE-2024-4577CRITICALArgument Injection in PHP-CGIEPSS 100.0%KEVCVE-2022-31626HIGHmysqlnd/pdo password buffer overflowEPSS 58.1%CVE-2022-31629MEDIUM$_COOKIE names string replacement (. -> _): cookie integrity vulnerabilitiesEPSS 49.6%CVE-2024-2756MEDIUM__Host-/__Secure- cookie bypass due to partial CVE-2022-31629 fixEPSS 38.1%