CVE-2023-33285
published 2023-05-22CVE-2023-33285: An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply…
PriorityP426medium5.3CVSS 3.1
AVNACLPRNUINSUCNINAL
EPSS
0.80%
52.2th percentile
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | qt6-base | < qt6-base 6.4.2+dfsg-10 (bookworm) | qt6-base 6.4.2+dfsg-10 (bookworm) |
| debian | qtbase-opensource-src | < qt6-base 6.4.2+dfsg-10 (bookworm) | qt6-base 6.4.2+dfsg-10 (bookworm) |
| debian | qtbase-opensource-src-gles | < qt6-base 6.4.2+dfsg-10 (bookworm) | qt6-base 6.4.2+dfsg-10 (bookworm) |
| msrc | cbl2_qt5-qtbase_5.12.11-9_on_cbl_mariner_2.0 | — | — |
| qt | qt | >= 5.0.0 < 5.15.4 | 5.15.4 |
| qt | qt | >= 6.0.0 < 6.2.9 | 6.2.9 |
| qt | qt | >= 6.3.0 < 6.5.1 | 6.5.1 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
osv7.5HIGH
vendor_ubuntu7.5HIGH
vendor_debian5.3MEDIUM
vendor_msrc5.3MEDIUM
vendor_redhat5.3MEDIUM
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Ubuntu
Qt vulnerabilities
vendor_ubuntu·2025-09-28·CVSS 7.5
CVE-2023-24607 [HIGH] Qt vulnerabilities
Title: Qt vulnerabilities
Summary: Several security issues were fixed in Qt.
It was discovered that Qt did not correctly handle certain inputs when
using the SQL ODBC driver plugin. An attacker could possibly use this issue
to cause a denial of service. (CVE-2023-24607)
It was discovered that Qt did not correctly parse certain strict-transport-
security headers. An attacker could possibly use this issue to leak
sensitive information. This issue only affected Ubuntu 20.04 LTS and Ubuntu
22.04 LTS. (CVE-2023-32762)
It was discovered that Qt did not correctly handle certain inputs from DNS
servers. A remote attacker could possibly use this issue to execute
arbitrary code or cause a denial of service. (CVE-2023-33285)
It was discovered that Qt did not correctly validate certain CA
certifi
Red Hat
qt: buffer over-read via a crafted reply from a DNS server
vendor_redhat·2023-05-22·CVSS 5.3
CVE-2023-33285 [MEDIUM] CWE-400 qt: buffer over-read via a crafted reply from a DNS server
qt: buffer over-read via a crafted reply from a DNS server
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
A vulnerability was discovered in Qt. This security flaw occurs in the QDnsLookup function, which has a buffer over-read via a crafted reply from a DNS server.
Package: qt (Red Hat Enterprise Linux 6) - Not affected
Package: qt3 (Red Hat Enterprise Linux 6) - Not affected
Package: qt (Red Hat Enterprise Linux 7) - Not affected
Package: qt3 (Red Hat Enterprise Linux 7) - Not affected
Microsoft
An issue was discovered in Qt 5.x before 5.15.14 6.x before 6.2.9 and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
vendor_msrc·2023-05-09·CVSS 5.3
CVE-2023-33285 [MEDIUM] CWE-125 An issue was discovered in Qt 5.x before 5.15.14 6.x before 6.2.9 and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
An issue was discovered in Qt 5.x before 5.15.14 6.x before 6.2.9 and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
M
Debian
CVE-2023-33285: qt6-base - An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x th...
vendor_debian·2023·CVSS 5.3
CVE-2023-33285 [MEDIUM] CVE-2023-33285: qt6-base - An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x th...
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
Scope: local
bookworm: resolved (fixed in 6.4.2+dfsg-10)
forky: resolved (fixed in 6.4.2+dfsg-10)
sid: resolved (fixed in 6.4.2+dfsg-10)
trixie: resolved (fixed in 6.4.2+dfsg-10)
OSV
qtbase-opensource-src vulnerabilities
osv·2025-09-28·CVSS 7.5
CVE-2023-24607 [HIGH] qtbase-opensource-src vulnerabilities
qtbase-opensource-src vulnerabilities
It was discovered that Qt did not correctly handle certain inputs when
using the SQL ODBC driver plugin. An attacker could possibly use this issue
to cause a denial of service. (CVE-2023-24607)
It was discovered that Qt did not correctly parse certain strict-transport-
security headers. An attacker could possibly use this issue to leak
sensitive information. This issue only affected Ubuntu 20.04 LTS and Ubuntu
22.04 LTS. (CVE-2023-32762)
It was discovered that Qt did not correctly handle certain inputs from DNS
servers. A remote attacker could possibly use this issue to execute
arbitrary code or cause a denial of service. (CVE-2023-33285)
It was discovered that Qt did not correctly validate certain CA
certificates for TLS. An attacker could possibl
GHSA
GHSA-pwf5-mq6w-f36v: An issue was discovered in Qt 5
ghsa_unreviewed·2023-05-22
CVE-2023-33285 [MEDIUM] CWE-125 GHSA-pwf5-mq6w-f36v: An issue was discovered in Qt 5
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
OSV
CVE-2023-33285: An issue was discovered in Qt 5
osv·2023-05-22·CVSS 5.3
CVE-2023-33285 [MEDIUM] CVE-2023-33285: An issue was discovered in Qt 5
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2023-05-22
Published