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CVE-2026-33337— Firebird has a buffer overflow when parsing corrupted slice packets

CVSS 7.5 · High EPSS 0.13% · P31
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I. Basic Information for CVE-2026-33337

Vulnerability Information
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Vulnerability Title
Firebird has a buffer overflow when parsing corrupted slice packets
Source: NVD (National Vulnerability Database)
Vulnerability Description
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Firebird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Firebird是Firebird基金会的一套开源跨平台的提供多个ANSI SQL-92功能的关系型数据库管理系统。 Firebird 5.0.4之前版本、4.0.7之前版本和3.0.14之前版本存在安全漏洞，该漏洞源于xdr_datum函数未验证cstring长度，可能导致缓冲区溢出，造成服务器崩溃或其他安全影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
FirebirdSQLfirebird >= 3.0.0, < 3.0.14 -

II. Public POCs for CVE-2026-33337

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III. Intelligence Information for CVE-2026-33337

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Vendor · 1Advisory · 1

Same Patch Batch · FirebirdSQL · 2026-04-17 · 9 CVEs total

CVE-2026-4034210.0 CRITICALFirebird: Path Traversal + Arbitrary File Write Leads to Remote Code Execution
CVE-2026-278908.2 HIGHFirebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments
CVE-2026-282248.2 HIGHFirebird Null Pointer Dereference via CryptCallback causes DOS
CVE-2025-651047.9 HIGHFirebird: Information leak vulnerability in firebird3 client when used with newer server
CVE-2026-352157.5 HIGHFirebird: DoS via malicious slice descriptor in slice packet
CVE-2026-342327.5 HIGHFirebird: DoS via `op_response` packet from client
CVE-2026-282127.5 HIGHFirebird has potential server crash via null pointer dereference when processing op_slice
CVE-2026-28214Firebird server hangs when using specific clumplet on batch creation

IV. Related Vulnerabilities

Same product: firebird
Same vendor: FirebirdSQL
Same weakness: CWE-120

V. Comments for CVE-2026-33337

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