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No exploitation reportedFix available

CVE-2020-25645

No exploitation reported by the sources we read.

  • Published2020-10-13
  • WeaknessCWE-319

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Timeline

dates in UTC
  1. 2020-10-1320:15CVE publishedNVD

Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
14.4= 14.04no fix published
16.4= 16.04no fix published
18.4= 18.04no fix published
20.4= 20.04no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
10.0= 10.0no fix published
Linux linux kernel
BranchAffectedFixed in
5.9< 5.9.05.9.0
5.9= 5.9.0no fix published

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kernelRed Hat:enterprise_linux:8::baseosall versions · fixed in 0:4.18.0-305.el8and 32 other packages
  • kernelRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:3.10.0-1160.21.1.el7and 18 other packages
  • kernelRed Hat:enterprise_linux:7::serverall versions · fixed in 0:3.10.0-1160.21.1.el7and 25 other packages
  • kernelRed Hat:enterprise_linux:7::clientall versions · fixed in 0:3.10.0-1160.21.1.el7and 18 other packages
  • kernelMageia:7all versions · fixed in 5.7.19-3.mga7
  • kernel-azureSUSE:Linux Enterprise Server for SAP Applications 12 SP5all versions · fixed in 4.12.14-16.34.1and 2 other packages
  • kernel-azureSUSE:Linux Enterprise Server 12 SP5all versions · fixed in 4.12.14-16.34.1and 2 other packages
  • kernel-azureSUSE:Linux Enterprise Module for Public Cloud 15 SP2all versions · fixed in 5.3.18-18.24.1and 2 other packages

204 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-25645 Red Hat Product Security305 products fixed · 44 known affected

    kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints

    kernel as a component of Red Hat Enterprise Linux 7 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 7 · kernel-alt.src as a component of Red Hat Enterprise Linux 7 · +41 more

  • RHSA-2021:1578 Red Hat Product Security120 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2021:0856 Red Hat Product Security155 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:0857 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2021:1578 · 120 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
  2. Workaround from the vendor Red Hat Product Security RHSA-2021:1578 · 120 productsA possible workaround for this flaw is to configure IPsec for all traffic between the endpoints, instead of specifically for the UDP port used by the GENEVE tunnels. If GENEVE tunnels are not used, this flaw will not be triggered. In that case, it is possible to disable those tunnels, by unloading …
  3. No fix available, says the vendor Red Hat Product Security CVE-2020-25645 · 16 productsAffected
  4. No fix planned, says the vendor Red Hat Product Security CVE-2020-25645 · 12 productsOut of support scope
  5. No fix planned, says the vendor Red Hat Product Security CVE-2020-25645 · 16 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-319known since 2026-10-23
  • NVDweakness (CWE)CWE-319read 2026-10-23
  • FIRST EPSSEPSS score2.4 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2020-10-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-gpwj-xrhp-6hpw

Frequently asked questions

What is CVE-2020-25645?

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Is CVE-2020-25645 actively exploited?

Active exploitation of CVE-2020-25645 has not been confirmed. Its EPSS score was 2.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25645?

CVE-2020-25645 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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