title: Ciphertext Malleability in TETRA
description: Lack of cryptographic integrity check on TETRA air-interface encrypted traffic. Since a stream cipher is employed, this allows an active adversary to manipulate cleartext data in a bit-by-bit fashion.
problem types: Missing Support for Integrity Check
affected:
{
defaultStatus: affected
vendor: ETSI
product: TETRA Standard
versions:
status: affected, version: all
}
metrics:
format: CVSS
scenarios: GENERAL
cvssV3_1: [
version: 3.1
attackVector: ADJACENT_NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: HIGH
availabilityImpact: LOW
baseScore: 5.9
baseSeverity: HIGH
vectorString: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L/E:U/RL:U/RC:R/CR:H/IR:H/AR:H/MAV:A/MAC:H/MPR:N/MUI:N/MS:U/MC:N/MI:H/MA:L
]