CVE-2020-27653

mediumpriority · track · 33OT risk · elevatedEPSS 0.008 · 57 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.83% (57th) EPSS

CVSS 5.1 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Algorithm downgrade vulnerability in QuickConnect in Synology Router Manager (SRM) before 1.2.4-8081 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via unspecified vectors.

cvss

Technical severity, 0–10. One row per scoring source.

8.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.1–8.3

v2.05.1mediumAV:N/AC:H/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 4.9 · impact 6.4

v3.18.3highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.6 · impact 6

v3.18.3highAV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.3highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.3highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Hsecondary · security@synology.comexploitability 1.6 · impact 6

v3.17.6highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-327USprimaryCWE-327USCWE-757US

affected products (5)

Products and version ranges known to be affected.

Synology Synology Router Manager (SRM)unspecified → 1.2.4-8081enisa_euvdEU
Synology Inc. DiskStation Manager≤ 6.2.3 25426fstec_bduRU
Synology Inc. Synology Router Manager (SRM)≤ 1.2.4-8081fstec_bduRU
synology diskstation manager= 6.2.3_25426nvdUScpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*
synology router manager1.2 → 1.2.4-8081nvdUScpe:2.3:a:synology:router_manager:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2020-10-29modified 2026-06-17

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+913 more

references (8)

External citations — patches, advisories, analysis.

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