EUVD-2026-21220

| CVE-2026-5778 LOW
2026-04-09 [email protected] GHSA-2jvp-h4w4-2vxh
2.1
CVSS 4.0

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

3
Analysis Generated
Apr 09, 2026 - 22:22 vuln.today
EUVD ID Assigned
Apr 09, 2026 - 22:22 euvd
EUVD-2026-21220
CVE Published
Apr 09, 2026 - 22:16 nvd
LOW 2.1

Tags

Buffer Overflow Integer Overflow

Description

Integer underflow in wolfSSL packet sniffer <= 5.9.0 allows an attacker to cause a program crash in the AEAD decryption path by injecting a TLS record shorter than the explicit IV plus authentication tag into traffic inspected by ssl_DecodePacket. The underflow wraps a 16-bit length to a large value that is passed to AEAD decryption routines, causing a large out-of-bounds read and crash. An unauthenticated attacker can trigger this remotely via malformed TLS Application Data records.

Analysis

Integer underflow in wolfSSL's packet sniffer (versions up to 5.9.0) allows remote attackers to crash applications during AEAD decryption by sending malformed TLS Application Data records with insufficient length for the explicit IV and authentication tag. The vulnerability wraps a 16-bit length value to an unexpectedly large integer, triggering an out-of-bounds read in decryption routines. …

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Priority Score

10
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +10
POC: 0

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EUVD-2026-21220 vulnerability details – vuln.today
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