How severe is CVE-2025-62820?

CVE-2025-62820 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2025-62820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-62820?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-62820 have an EU (EUVD) identifier?

Yes. CVE-2025-62820 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35657.

When was CVE-2025-62820 published?

CVE-2025-62820 was published on 2025-10-23 and last updated on 2026-06-17.

CVE-2025-62820

CVE-2025-62820 is a medium-severity vulnerability with a CVSS 3.x base score of 4.9. 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-420.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35657
Weakness: CWE-420
Published: 2025-10-23
Last modified: 2026-06-17

Description

Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.

Frequently asked questions

What is CVE-2025-62820?: Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.
How severe is CVE-2025-62820?: CVE-2025-62820 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2025-62820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-62820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62820 have an EU (EUVD) identifier?: Yes. CVE-2025-62820 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35657.
When was CVE-2025-62820 published?: CVE-2025-62820 was published on 2025-10-23 and last updated on 2026-06-17.

References

Other CWE-420 vulnerabilities

CVE-2023-20198 — Critical (CVSS 10.0): Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco…
CVE-2025-52921 — Critical (CVSS 9.9): In Innoshop through 0.4.1, an authenticated attacker could exploit the File Manager functions in the admin panel to…
CVE-2025-13315 — Critical (CVSS 9.8): Twonky Server 8.5.2 on Linux and Windows is vulnerable to an access control flaw. An unauthenticated attacker can…
CVE-2025-54309 — Critical (CVSS 9.0): CrushFTP 10 before 10.8.5 and 11 before 11.3.4_23, when the DMZ proxy feature is not used, mishandles AS2 validation…
CVE-2025-54351 — High (CVSS 8.9): In iperf before 3.19.1, net.c has a buffer overflow when --skip-rx-copy is used (for MSG_TRUNC in recv).
CVE-2026-40217 — High (CVSS 8.8): LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the…

Browse all CWE-420 vulnerabilities →