EUVD-2026-45396Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Reliable single-packet crash gives AC:L and A:H; authenticated SFTP account required so PR:L; only DoS is demonstrated so C:N/I:N.
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionCVE.org
ProFTPD mod_sftp contains a heap-based buffer overflow reachable by an authenticated SFTP user. The fxp_packet_read() function accepts the attacker-supplied 32-bit big-endian SFTP packet length without a minimum sanity check. A value of 0 causes an unsigned subtraction elsewhere in the read path to underflow to approximately 4 GB. That oversized request reaches the core memory allocator, where the rounded size is computed in size_t but passed to new_block() as a 32-bit int; the low 32 bits of 0x100000000 are 0, so new_block() returns a small (~512-byte) block while the caller is told it received ~4 GB. The subsequent fill loop then streams attacker-controlled bytes past the end of the 544-byte allocation, producing an attacker-controlled heap buffer overflow. An authenticated user can crash the per-connection ProFTPD session child on demand with a single malformed SFTP packet (packet_len=0 followed by a body greater than approximately 544 bytes), producing reliable authenticated remote denial of service. Depending on heap layout and adjacent allocations, heap metadata corruption and further consequences beyond denial of service may be possible, though only denial of service is demonstrated by the supplied proof of concept.
AnalysisAI
Authenticated remote denial of service in ProFTPD's mod_sftp module allows any user with valid SFTP credentials to crash the per-connection server child with a single malformed packet. The flaw stems from an unsigned integer underflow and a size_t-to-int truncation that fools the allocator into returning a ~512-byte block while the caller believes it received ~4 GB, causing an attacker-controlled heap overflow past a 544-byte allocation. Publicly available exploit code exists (a VulnCheck proof of concept) demonstrating reliable DoS; heap metadata corruption and consequences beyond DoS are theorized but not demonstrated, and there is no public exploit identified for code execution.
The mod_copy module in ProFTPD 1.3.5 allows remote attackers to read and write to arbitrary files via the site cpfr and
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remot
An arbitrary file copy vulnerability in mod_copy in ProFTPD up to 1.3.5b allows for remote code execution and informatio
SQL injection escalating to remote code execution in ProFTPD's mod_sql before 1.3.10rc1 lets remote attackers inject SQL
SQL injection in ProFTPD 1.3.9a and earlier allows remote attackers to execute arbitrary SQL commands when the 'UseRever
make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandl
ProFTPD before 1.3.6b and 1.3.7rc before 1.3.7rc2 allows remote unauthenticated denial-of-service due to incorrect handl
Integer overflow in kbdint.c in mod_sftp in ProFTPD 1.3.4d and 1.3.5r3 allows remote attackers to cause a denial of serv
In ProFTPD 1.3.7, it is possible to corrupt the memory pool by interrupting the data transfer channel. Rated high severi
Arbitrary code execution in ProFTPD's mod_sftp module (versions before 1.3.9c and 1.3.10rc3) allows authenticated low-pr
Directory ACL bypass in ProFTPD (through 1.3.9b and 1.3.10rc2) lets authenticated FTP users reach files inside DenyAll-p
The mod_tls module in ProFTPD before 1.3.5b and 1.3.6 before 1.3.6rc2 does not properly handle the TLSDHParamFile direct
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise High Performance Computing 15 SP7 | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
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