CVE-2022-20968

A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware could allow an unauthenticated, adjacent attacker to cause a stack overflow on an affected device. This vulnerability is due to insufficient input validation of received Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol traffic to an affected device. A successful exploit could allow the attacker to cause a stack overflow, resulting in possible remote code execution or a denial of service (DoS) condition on an affected device.

Published: 2022-12-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-20968 is rated High Risk (66.4/100): CVSS High severity, with high exploitation likelihood (EPSS 6.35%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.51% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-20968

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.84% 6.35% +1.51%
2 2026-06-13 8.03% 4.84% -3.18%
3 2026-05-31 — 8.03% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-20968

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.2 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2022-20968

Affected software / configurations for CVE-2022-20968

Vendor Product Version Raw CPE
cisco ip_phone_7811_firmware 9.3\(3\) cpe:2.3:o:cisco:ip_phone_7811_firmware:9.3\(3\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 9.3\(4\) cpe:2.3:o:cisco:ip_phone_7811_firmware:9.3\(4\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 9.3\(4\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:9.3\(4\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 9.3\(4\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:9.3\(4\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 9.3\(4\)sr3 cpe:2.3:o:cisco:ip_phone_7811_firmware:9.3\(4\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.1\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.1\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.1\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.1\(1.9\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.1\(1.9\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.2\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.2\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.2\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.2\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.2\(2\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.2\(2\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr3 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr4 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr4:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr4b cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr4b:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr5 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr5:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr6 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr6:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1\)sr7 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1\)sr7:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1.9\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1.9\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(1.11\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(1.11\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.3\(2\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.3\(2\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.4\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:10.4\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 10.4\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:10.4\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11-0-1msr1-1 cpe:2.3:o:cisco:ip_phone_7811_firmware:11-0-1msr1-1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11.0\(0.7\) cpe:2.3:o:cisco:ip_phone_7811_firmware:11.0\(0.7\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11.0\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:11.0\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11.5\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:11.5\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11.5\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:11.5\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 11.7\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:11.7\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.0\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.0\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.0\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.0\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.0\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.0\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.0\(1\)sr3 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.0\(1\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.1\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.1\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.1\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.1\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.5\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.5\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.5\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.5\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.5\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.5\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.5\(1\)sr3 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.5\(1\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.6\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.6\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.6\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.6\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.7\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.7\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.7\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.7\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.8\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:12.8\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.8\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.8\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 12.8\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:12.8\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.0\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:14.0\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.0\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:14.0\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.0\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:14.0\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.0\(1\)sr3 cpe:2.3:o:cisco:ip_phone_7811_firmware:14.0\(1\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.1\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:14.1\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.1\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7811_firmware:14.1\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 9.3\(3\) cpe:2.3:o:cisco:ip_phone_7821_firmware:9.3\(3\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 9.3\(4\) cpe:2.3:o:cisco:ip_phone_7821_firmware:9.3\(4\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 9.3\(4\)sr1 cpe:2.3:o:cisco:ip_phone_7821_firmware:9.3\(4\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 9.3\(4\)sr2 cpe:2.3:o:cisco:ip_phone_7821_firmware:9.3\(4\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 9.3\(4\)sr3 cpe:2.3:o:cisco:ip_phone_7821_firmware:9.3\(4\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.1\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.1\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.1\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.1\(1.9\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.1\(1.9\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.2\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.2\(1\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.2\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.2\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.2\(2\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.2\(2\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr1 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr1:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr3 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr3:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr4 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr4:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr4b cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr4b:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr5 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr5:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr6 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr6:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1\)sr7 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1\)sr7:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1.9\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1.9\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(1.11\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(1.11\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.3\(2\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.3\(2\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.4\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:10.4\(1\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 10.4\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7821_firmware:10.4\(1\)sr2:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 11-0-1msr1-1 cpe:2.3:o:cisco:ip_phone_7821_firmware:11-0-1msr1-1:*:*:*:*:*:*:*

References for CVE-2022-20968

cvelogic Threat Intelligence