CVE-2026-4621

Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.

Published: 2026-03-27 Last update: 2026-04-20 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-4621 is rated Low Risk (27.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.16%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2026-4621

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 0.06% 0.16% +0.10%
2 2026-04-02 0.04% 0.06% +0.01%
3 2026-03-28 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-4621

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.3 4.0 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:H)
Exploitation depends on constrained or hard-to-reproduce conditions.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:L)
Limited confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:L)
Limited integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:L)
Limited availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [email protected]
5.6 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 3.4 [email protected]

Weakness enumeration for CVE-2026-4621

GitHub Security Advisory for CVE-2026-4621

GHSA-v782-gww8-28q2 · Severity: medium — Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to...

Affected software / configurations for CVE-2026-4621

Vendor Product Version Raw CPE
nec aterm_wg1200hp4_firmware — cpe:2.3:o:nec:aterm_wg1200hp4_firmware:*:*:*:*:*:*:*:*
nec aterm_wg2600hs_firmware < 1.7.2 cpe:2.3:o:nec:aterm_wg2600hs_firmware:*:*:*:*:*:*:*:*
nec aterm_wf1200cr_firmware < 1.6.0 cpe:2.3:o:nec:aterm_wf1200cr_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200cr_firmware < 1.5.0 cpe:2.3:o:nec:aterm_wg1200cr_firmware:*:*:*:*:*:*:*:*
nec aterm_wg2600hp4_firmware < 1.4.2 cpe:2.3:o:nec:aterm_wg2600hp4_firmware:*:*:*:*:*:*:*:*
nec aterm_wg2600hm4_firmware < 1.4.2 cpe:2.3:o:nec:aterm_wg2600hm4_firmware:*:*:*:*:*:*:*:*
nec aterm_wg2600hs2_firmware < 1.3.2 cpe:2.3:o:nec:aterm_wg2600hs2_firmware:*:*:*:*:*:*:*:*
nec aterm_wx3000hp_firmware < 2.5.0 cpe:2.3:o:nec:aterm_wx3000hp_firmware:*:*:*:*:*:*:*:*
nec aterm_wx3600hp_firmware <= 1.5.3 cpe:2.3:o:nec:aterm_wx3600hp_firmware:*:*:*:*:*:*:*:*
nec aterm_w1200ex-ms_firmware — cpe:2.3:o:nec:aterm_w1200ex-ms_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200hp2_firmware — cpe:2.3:o:nec:aterm_wg1200hp2_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1900hp_firmware — cpe:2.3:o:nec:aterm_wg1900hp_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200hs2_firmware — cpe:2.3:o:nec:aterm_wg1200hs2_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1800hp3_firmware — cpe:2.3:o:nec:aterm_wg1800hp3_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200hp3_firmware — cpe:2.3:o:nec:aterm_wg1200hp3_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1900hp2_firmware — cpe:2.3:o:nec:aterm_wg1900hp2_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200hs3_firmware — cpe:2.3:o:nec:aterm_wg1200hs3_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1800hp4_firmware — cpe:2.3:o:nec:aterm_wg1800hp4_firmware:*:*:*:*:*:*:*:*
nec aterm_wg1200hs4_firmware — cpe:2.3:o:nec:aterm_wg1200hs4_firmware:*:*:*:*:*:*:*:*
nec aterm_wx1500hp_firmware < 1.4.2 cpe:2.3:o:nec:aterm_wx1500hp_firmware:*:*:*:*:*:*:*:*
nec aterm_wx3000hp2_firmware < 1.3.2 cpe:2.3:o:nec:aterm_wx3000hp2_firmware:*:*:*:*:*:*:*:*

References for CVE-2026-4621

cvelogic Threat Intelligence