Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Software-Based SSL/TLS Denial of Service Vulnerability (Cisco Cisco Adaptive Security Appliance (ASA) Software)

CVE-2021-34783

HIGH 8.6

En bref

Source: NVD
EPSS: EPSS 1.61 % · centile 76 (2026-10-31)
État: PUBLISHED
Publiée: 2021-10-27 18:55 UTC
Mise à jour: 2024-11-07 21:46 UTC
Attribuée par: cisco
Statut NVD: Modified

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Description

A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability.

Faiblesses (CWE)

CWE-119 — Opération hors des limites d'un tampon mémoire
CWE-20 — Validation d'entrée incorrecte

Références

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	cisco
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	NVD · psirt@cisco.com (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	HIGH 7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C	NVD · nvd@nist.gov (Primary)

Références européennes

ENISA EUVD · EUVD-2021-21433
GCVE · GCVE-0-2021-34783

Avis du CERT-FR

CERTFR-2021-AVI-829 — Multiples vulnérabilités dans les produits Cisco · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* ≥ 6.4.0 < 6.4.0.13
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* ≥ 6.6.0 < 6.6.5
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* ≥ 6.7.0 < 6.7.0.3
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* ≥ 7.0.0 < 7.0.1
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* ≥ 9.8.0 < 9.8.4.40
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* ≥ 9.12.0 < 9.12.4.29
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* ≥ 9.14.0 < 9.14.3.9
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* ≥ 9.15.0 < 9.15.1.17
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* ≥ 9.16.0 < 9.16.2
cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*

Produits affectés

Produit	Versions
Cisco · Cisco Adaptive Security Appliance (ASA) Software	affected n/a

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

⚠️ Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Software-Based SSL/TLS Denial of Service Vulnerability (Cisco Cisco Adaptive Security Appliance (ASA) Software)