CVE-2021-21704

Multiple vulnerabilities in Firebird client extension

At a glance

Severity: MEDIUM 5.0
EPSS: EPSS 1.80 % · percentile 78 (2026-10-28)
State: PUBLISHED
Published: 2021-10-04
Updated: 2024-09-17
Assigner: php
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L	php
CVSS 3.1	MEDIUM 5.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L	NVD · security@php.net (Secondary)
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2021-8876
GCVE · GCVE-0-2021-21704

CERT-FR advisories

CERTFR-2023-AVI-0537 — Multiples vulnérabilités dans les produits Juniper · cert.ssi.gouv.fr
CERTFR-2021-AVI-571 — Multiples vulnérabilités dans Tenable · cert.ssi.gouv.fr
CERTFR-2021-AVI-501 — Multiples vulnérabilités dans PHP · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 7.3.0 < 7.3.29
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 7.4.0 < 7.4.21
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 8.0.0 < 8.0.8
cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*

Affected products

Product	Versions
PHP Group · PHP	affected 7.3.x < 7.3.29 ; affected 7.4.x < 7.4.21 ; affected 8.0.X < 8.0.8

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD