CVE-2020-3566
Cisco IOS XR: Software DVMRP Memory Exhaustion
As of , CVE-2020-3566 in Cisco IOS XR is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 3 May 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.04Higher than 89% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
CISA's description
A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory of an affected device. The vulnerability is due to insufficient queue management for Internet Group Management Protocol (IGMP) packets. An attacker could exploit this vulnerability by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to cause memory exhaustion, resulting in instability of other processes. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address this vulnerability.
The CVE record's description, from cisco
- CVE published
- 29 August 2020
- Assigned by
- cisco
- CVSS
- 8.6 High (CVSS 3.1, from the CNA)
- CWE-400
- Uncontrolled Resource Consumption
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- partial
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
IOS XR: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2022-20821Open Port | Cisco IOS XR | Patch soon | 0.11 | ||
| CVE-2020-3118Software Discovery Protocol Format String | Cisco IOS XR | Patch soon | 0.12 | ||
| CVE-2010-3035Border Gateway Protocol (BGP) Denial-of-Service | Cisco IOS XR | Patch soon | 0.06 | ||
| CVE-2009-2055Border Gateway Protocol (BGP) Denial-of-Service | Cisco IOS XR | Patch soon | 0.03 | ||
| CVE-2020-3569Software DVMRP Memory Exhaustion | Cisco IOS XR | Patch soon | 0.03 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org