CVE-2020-1749

mediumpriority · track · 30OT risk · elevatedEPSS 0.012 · 69 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.24% (69th) EPSS

CVSS 5 · medium

Is it mine?

14 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · secalert@redhat.com USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-319USCWE-319US

affected products (14)

Products and version ranges known to be affected.

Linux kernel Kernel≤ 5.5enisa_euvdEU
Red Hat Inc. Red Hat Enterprise Linux≤ 8fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 7fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 6fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 5fstec_bduRU
Сообщество свободного программного обеспечения Linux4.0 → 4.4.223fstec_bduRU
Сообщество свободного программного обеспечения Linux4.10 → 4.14.180fstec_bduRU
Сообщество свободного программного обеспечения Linux4.15 → 4.19.118fstec_bduRU
Сообщество свободного программного обеспечения Linux4.20 → 5.3.17fstec_bduRU
Сообщество свободного программного обеспечения Linux4.5 → 4.9.223fstec_bduRU
Сообщество свободного программного обеспечения Linux5.4.0 → 5.4.4fstec_bduRU
linux linux kernelall versionsnvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhat enterprise linux= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux:*:*:*:*:*:*:*:*
redhat enterprise mrg= 2.0nvdUScpe:2.3:o:redhat:enterprise_mrg:*:*:*:*:*:*:*:*

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 2020-09-09modified 2026-06-17

references (37)

External citations — patches, advisories, analysis.

scry

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