CyberSecBulletin
CVE-2022-20690NVD status: Modified

Cisco Analog Telephone Adaptor (ATA) Software: Improper Validation of Specified Quantity in Input

Published Updated By the CyberSecBulletin desk

CVE-2022-20690 is a high-severity improper validation of specified quantity in input vulnerability in Cisco Analog Telephone Adaptor (ATA) Software from Cisco, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected Cisco Analog Telephone Adaptor (ATA) Software versions: 1.2.1; 1.2.2 SR1; 1.2.2, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.79% chance of exploitation within 30 days, higher than 57% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Ata 191 Firmware to 11.2.2 or 12.0.1, whichever matches your release line, or a later version.
  2. Update Ata 192 Firmware to 11.2.2 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
CiscoCisco Analog Telephone Adaptor (ATA) Software1.2.1; 1.2.2 SR1; 1.2.2; 1.2.2 SR2; 11.1.0 MSR4; 11.1.0; 11.1.0 MSR1; 11.1.0 MSR2; and 10 more rangesNot stated
CiscoAta 190 FirmwareNot specified in the recordNot stated
CiscoAta 191 Firmwarebefore 11.2.2; before 12.0.1; 12.0.111.2.2, 12.0.1
CiscoAta 192 Firmwarebefore 11.2.211.2.2

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.15.3MediumCNA (cisco.com)
CVSS 3.18.8HighNVD

Official description

Multiple vulnerabilities in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, adjacent attacker to cause Cisco Discovery Protocol memory corruption on an affected device. These vulnerabilities are due to missing length validation checks when processing Cisco Discovery Protocol messages. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause an out-of-bounds read of the valid Cisco Discovery Protocol packet data, which could allow the attacker to cause corruption in the internal Cisco Discovery Protocol database of the affected device.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Validation of Specified Quantity in Input

The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

More Improper Validation of Specified Quantity in Input vulnerabilities (CWE-1284)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Cisco Analog Telephone Adaptor (ATA) Software

All Cisco Analog Telephone Adaptor (ATA) Software vulnerabilities

Recent Improper Validation of Specified Quantity in Input vulnerabilities

Spotted an error? Tell us.