CVE-2021-35979

An issue was discovered in Digi RealPort through 4.8.488.0. The 'encrypted' mode is vulnerable to man-in-the-middle attacks and does not perform authentication.

Published: 2021-10-08 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-35979 is rated Moderate Risk (48.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.26%). 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-2021-35979

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 2025-03-30 0.40% 0.26% -0.14%
2 2025-03-29 0.26% 0.40% +0.14%
3 2025-03-17 — 0.26% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-35979

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.
 2.2 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-35979

Affected software / configurations for CVE-2021-35979

Vendor Product Version Raw CPE
digi realport <= 1.9-40 cpe:2.3:a:digi:realport:*:*:*:*:*:linux:*:*
digi realport <= 4.8.488.0 cpe:2.3:a:digi:realport:*:*:*:*:*:windows:*:*
digi connectport_ts_8\/16_firmware — cpe:2.3:o:digi:connectport_ts_8\/16_firmware:*:*:*:*:*:*:*:*
digi connectport_lts_8\/16\/32_firmware — cpe:2.3:o:digi:connectport_lts_8\/16\/32_firmware:*:*:*:*:*:*:*:*
digi passport_integrated_console_server_firmware — cpe:2.3:o:digi:passport_integrated_console_server_firmware:*:*:*:*:*:*:*:*
digi cm_firmware — cpe:2.3:o:digi:cm_firmware:*:*:*:*:*:*:*:*
digi portserver_ts_firmware — cpe:2.3:o:digi:portserver_ts_firmware:*:*:*:*:*:*:*:*
digi portserver_ts_mei_firmware — cpe:2.3:o:digi:portserver_ts_mei_firmware:*:*:*:*:*:*:*:*
digi portserver_ts_mei_hardened_firmware — cpe:2.3:o:digi:portserver_ts_mei_hardened_firmware:*:*:*:*:*:*:*:*
digi portserver_ts_m_mei_firmware — cpe:2.3:o:digi:portserver_ts_m_mei_firmware:*:*:*:*:*:*:*:*
digi 6350-sr_firmware — cpe:2.3:o:digi:6350-sr_firmware:*:*:*:*:*:*:*:*
digi portserver_ts_p_mei_firmware — cpe:2.3:o:digi:portserver_ts_p_mei_firmware:*:*:*:*:*:*:*:*
digi transport_wr11_xt_firmware — cpe:2.3:o:digi:transport_wr11_xt_firmware:*:*:*:*:*:*:*:*
digi one_iap_family_firmware — cpe:2.3:o:digi:one_iap_family_firmware:*:*:*:*:*:*:*:*
digi one_ia_firmware — cpe:2.3:o:digi:one_ia_firmware:*:*:*:*:*:*:*:*
digi wr31_firmware — cpe:2.3:o:digi:wr31_firmware:*:*:*:*:*:*:*:*
digi wr44_r_firmware — cpe:2.3:o:digi:wr44_r_firmware:*:*:*:*:*:*:*:*
digi connect_es_firmware — cpe:2.3:o:digi:connect_es_firmware:*:*:*:*:*:*:*:*
digi wr21_firmware — cpe:2.3:o:digi:wr21_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-35979

cvelogic Threat Intelligence