SYN flood denial of service in BIG-IP SNAT implementation
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-22998 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
BIG-IP Hardware solutions / Firmware BIG-IP LTM Hardware solutions / Security hardware applicances BIG-IP AFM Hardware solutions / Security hardware applicances BIG-IP Analytics Hardware solutions / Security hardware applicances BIG-IP APM Hardware solutions / Security hardware applicances BIG-IP ASM Hardware solutions / Security hardware applicances BIG-IP FPS Hardware solutions / Security hardware applicances BIG-IP GTM Hardware solutions / Security hardware applicances BIG-IP PEM Hardware solutions / Security hardware applicances BIG-IP AAM Hardware solutions / Routers & switches, VoIP, GSM, etc BIG-IP DNS Hardware solutions / Routers & switches, VoIP, GSM, etc BIG-IP Link Controller Hardware solutions / Routers & switches, VoIP, GSM, etc |
| Vendor | F5 Networks |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Resource exhaustion
EUVDB-ID: #VU51419
Risk: Medium
CVSSv4.0: [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-22998
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to SYN flood protection thresholds are not enforced in secure network address translation (SNAT) listeners. A remote attacker can perform SYN flood class attacks.
MitigationInstall updates from vendor's website.
Vulnerable software versionsBIG-IP: 11.6.1 HF1 - 16.0.1
BIG-IP LTM: 11.6.1 HF1 - 16.0.1
BIG-IP AAM: 11.6.1 HF1 - 16.0.1
BIG-IP AFM: 11.6.1 HF1 - 16.0.1
BIG-IP Analytics: 11.6.1 HF1 - 16.0.1
BIG-IP APM: 11.6.1 HF1 - 16.0.1
BIG-IP ASM: 11.6.1 HF1 - 16.0.1
BIG-IP DNS: 11.6.1 - 16.0.1
BIG-IP FPS: 11.6.1 - 16.0.1
BIG-IP GTM: 11.6.1 HF1 - 16.0.1
BIG-IP Link Controller: 11.6.1 HF1 - 16.0.1
BIG-IP PEM: 11.6.1 HF1 - 16.0.1
CPE2.3- cpe:2.3:h:f5_networks:big-ip:11.6.5.2:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:12.1.5.2:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:13.1.3.5:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:14.1.3.1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:15.0.1.4:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:15.1.2:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip:16.0.1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_ltm:11.6.1 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_ltm:11.6.1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_ltm:11.6.2 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_aam:11.6.1:HF1:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_afm:11.6.1:HF1:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_analytics:11.6.1 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_apm:11.6.1:HF1:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_asm:11.6.1 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_dns:11.6.1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_fps:11.6.1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_gtm:11.6.1 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_link_controller:11.6.1 HF1:*:*:*:*:*:*:*
- cpe:2.3:h:f5_networks:big-ip_pem:11.6.1 HF1:*:*:*:*:*:*:*
http://support.f5.com/csp/article/K31934524
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
