Which WPA vulnerability allowed packet injection and decryption attacks?

WPA with TKIP suffers from vulnerabilities inherited from WEP, particularly the use of weak Initialization Vectors (IVs). CEH v13 explains that these weaknesses allow attackers to perform packet injection and partial decryption attacks.

Although WPA improved upon WEP, TKIP was designed as a temporary solution and still relies on predictable IV behavior. This makes Option C correct.

Lack of AES (Option A) explains why WPA is weaker than WPA2 but does not directly describe the exploit mechanism. Weak passwords (Option D) affect authentication, not packet injection. GTK predictability (Option B) is relevant but not the primary cause here.

CEH v13 explicitly states that IV reuse and predictability in TKIP enable practical attacks. Therefore, Option C is correct.