CVE-2021-1616: cisco ios xe

csirt@kutim:~/threat-intel/cve/CVE-2021-1616

CVSS 4.7 · Medium EPSS 1,2%

Kerentanan Protection Mechanism Failure pada cisco ios xe. Skor CVSS 3.1 4.7 (Medium) menurut NVD.

Deskripsi (NVD)

A vulnerability in the H.323 application level gateway (ALG) used by the Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass the ALG. This vulnerability is due to insufficient data validation of traffic that is traversing the ALG. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device. A successful exploit could allow the attacker to bypass the ALG and open connections that should not be allowed to a remote device located behind the ALG. Note: This vulnerability has been publicly discussed as NAT Slipstreaming.

Rincian

Terbit di NVD: 23 September 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 4.7 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-693: Protection Mechanism Failure
EPSS (30 hari): 1,2% peluang dieksploitasi; lebih tinggi dari 67,2% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
cisco	ios xe	Semua versi sebelum 17.6.1

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-h323alg-bypass-4vy2MP2Q advisory vendor

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.