CVE-2020-5686: nec corporation univerge sv9500/sv8500 series Improper Authentication
CVSS: 7.5v3.1HighModified
Published 13-01-2021Last modified 04-08-2024
Vulnerability summary
CVE-2020-5686 is a high (CVSS 7.5) Improper Authentication vulnerability in nec corporation univerge sv9500/sv8500 series. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67.2% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.18%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-01-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Incorrect implementation of authentication algorithm issue in UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an attacker to access the remote system maintenance feature and obtain the information by sending a specially crafted request to a specific URL.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.18%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
+0.01 pp
From 1.16% on 20-09-2026
20-09-202620-10-2026
EPSS score1.18%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Nec2 products
- univerge_sv8500_firmware≥ s6, ≤ s8
- univerge_sv9500_firmware≥ v1, ≤ v7
Nec corporation1 product
- univerge sv9500/sv8500 seriesSV9500 series from V1 to V7and SV8500 series from S6 to S8
2 vendors · 3 products