What is CVE-2025-57623?

CVE-2025-57623 is a medium-severity vulnerability in Totolink N600r, classified under NULL Pointer Dereference. CVSS score: 5.3/10. Published 2025-09-25.

How severe is CVE-2025-57623?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2025-57623 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Totolink N600r

CVE-2025-57623

A NULL pointer dereference in TOTOLINK N600R firmware v4.3.0cu.7866_B2022506 allows attackers to cause a Denial of Service.

Published 2025-09-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (29.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Totolink N600r
Totolink N600r Firmware — versions 4.3.0cu.7866_b2022506

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

github.com/z472421519/BinaryAudit/blob/main/PoC/NPD/TOTOLink/CONTENT_LENGTH.md (Exploit)
gist.github.com/z472421519/d17061ea79a72d39fe69c000fa1a6280 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-57623?: CVE-2025-57623 is a medium-severity vulnerability in Totolink N600r, classified under NULL Pointer Dereference. CVSS score: 5.3/10. Published 2025-09-25.
How severe is CVE-2025-57623?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-57623 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.