How severe is CVE-2019-20027?

CVE-2019-20027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-20027 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20027?

CVE-2019-20027 primarily affects Nec Sv8100 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-20027?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-20027 published?

CVE-2019-20027 was published on 2020-07-29 and last updated on 2026-06-17.

CVE-2019-20027

CVE-2019-20027 is a critical-severity vulnerability in Nec Sv8100 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Nec Sv8100 Firmware
Published: 2020-07-29
Last modified: 2026-06-17

Description

Aspire-derived NEC PBXes, including the SV8100, SV9100, SL1100 and SL2100 with software releases 7.0 or higher contain the possibility if incorrectly configured to allow a blank username and password combination to be entered as a valid, successfully authenticating account.

Frequently asked questions

What is CVE-2019-20027?: Aspire-derived NEC PBXes, including the SV8100, SV9100, SL1100 and SL2100 with software releases 7.0 or higher contain the possibility if incorrectly configured to allow a blank username and password combination to be entered as a valid, successfully authenticating account.
How severe is CVE-2019-20027?: CVE-2019-20027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-20027 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20027?: CVE-2019-20027 primarily affects Nec Sv8100 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-20027?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-20027 published?: CVE-2019-20027 was published on 2020-07-29 and last updated on 2026-06-17.

References

https://shadytel.su/files/nec_cve.txt

Affected products (4)

cpe:2.3:o:nec:sv8100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:sv9100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:sl1100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:sl2100_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Nec Sv8100 Firmware

CVE-2019-20033 — Critical (CVSS 9.8): On Aspire-derived NEC PBXes, including all versions of SV8100 devices, a set of documented, static login credentials…
CVE-2019-20029 — High (CVSS 8.8): An exploitable privilege escalation vulnerability exists in the WebPro functionality of Aspire-derived NEC PBXes,…
CVE-2019-20028 — High (CVSS 7.5): Aspire-derived NEC PBXes operating InMail software, including all versions of SV8100, SV9100, SL1100 and SL2100 devices…
CVE-2019-20032 — Medium (CVSS 6.5): An attacker with access to an InMail voicemail box equipped with the find me/follow me feature on Aspire-derived NEC…

All CVEs affecting Nec Sv8100 Firmware →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →