CVE-2022-22195 | Junos OS Evolved: Specific packets reaching the RE lead to a counter overflow and eventually a crash

An Improper Update of Reference Count vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to trigger a counter overflow, eventually causing a Denial of Service (DoS). This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R3-S1-EVO; 21.1 versions prior to 21.1R3-EVO; 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO. This issue does not affect Juniper Networks Junos OS.

Published: 2022-04-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-22195 is rated Moderate Risk (50.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.99%). Review affected assets and schedule 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-2022-22195

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 0.63% 0.99% +0.35%
2 2025-11-21 0.42% 0.63% +0.21%
3 2025-11-18 — 0.42% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-22195

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2022-22195

Affected software / configurations for CVE-2022-22195

Vendor Product Version Raw CPE
juniper junos_os_evolved < 20.4 cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s3:*:*:*:*:*:*
juniper junos_os_evolved 20.4 cpe:2.3:o:juniper:junos_os_evolved:20.4:r3:*:*:*:*:*:*
juniper junos_os_evolved 21.1 cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*
juniper junos_os_evolved 21.1 cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*
juniper junos_os_evolved 21.1 cpe:2.3:o:juniper:junos_os_evolved:21.1:r2:*:*:*:*:*:*
juniper junos_os_evolved 21.2 cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
juniper junos_os_evolved 21.2 cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*
juniper junos_os_evolved 21.2 cpe:2.3:o:juniper:junos_os_evolved:21.2:r2:*:*:*:*:*:*
juniper junos_os_evolved 21.3 cpe:2.3:o:juniper:junos_os_evolved:21.3:r1:*:*:*:*:*:*
juniper junos_os_evolved 21.3 cpe:2.3:o:juniper:junos_os_evolved:21.3:r1-s1:*:*:*:*:*:*

References for CVE-2022-22195

URL Tags
https://kb.juniper.net/JSA69508 Vendor Advisory
cvelogic Threat Intelligence