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CVE-2020-25643· NVD / CVE Program· CNA redhat

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7.

Noroxi assessment

Priority: Monitor (action score 29/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.2% (FIRST EPSS); higher than 88.3% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:10) 4.19.152-1; linux (Debian:12) 5.8.14-1.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:10) 4.19.152-1; linux (Debian:12) 5.8.14-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

HighCVSS 7.2 · v3.1—No exploit Fix available
Published
Oct 6, 2020
Updated
Jun 16, 2026
EPSS
3.2% · 88th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux
opensuseleap
debiandebian linux
netapph410c firmware
netapph410c
starwindsoftwarestarwind virtual san

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux9.0
  • linux linux kernel4.10 and later · before 4.14.200
  • linux linux kernel4.15 and later · before 4.19.148
  • linux linux kernel4.20 and later · before 5.4.68
  • linux linux kernel5.5 and later · before 5.8.12
  • linux linux kernel2.6.29 and later · before 4.4.238
  • linux linux kernel4.5 and later · before 4.9.238
  • linux linux kernel5.9.0
  • netapp h410c firmwareall versions
  • opensuse leap15.1
  • opensuse leap15.2
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • starwindsoftware starwind virtual sanv8

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a kernel

    • Linux kernel versions before 5.9-rc7affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-305.el84.18.0-305.el8
Debian:10linuxbefore 4.19.152-14.19.152-1
Debian:12linuxbefore 5.8.14-15.8.14-1
Debian:9linux-4.19before 4.19.152-1~deb9u14.19.152-1~deb9u1
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.71.14.12.14-lp151.28.71.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.71.14.12.14-lp151.28.71.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.71.14.12.14-lp151.28.71.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.71.24.12.14-lp151.28.71.2
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-default-basebefore 5.3.18-lp152.50.1.lp152.8.10.15.3.18-lp152.50.1.lp152.8.10.1
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.47.15.3.18-lp152.47.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-obs-qabefore 5.3.18-lp152.47.15.3.18-lp152.47.1
openSUSE:Leap 15.2kernel-preemptbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-sourcebefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-symsbefore 5.3.18-lp152.47.15.3.18-lp152.47.1
Red Hat:enterprise_linux:7::clientbpftoolbefore 0:3.10.0-1160.11.1.el70:3.10.0-1160.11.1.el7

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-26541Oct 2, 2020 · The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism.
    26Monitor
  • ← EarlierCVE-2020-25641Oct 6, 2020 · A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7.
    22Monitor
  • Later →CVE-2020-25645Oct 13, 2020 · A flaw was found in the Linux kernel in versions before 5.9-rc7.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:kernel-tools-libs-devel4.18.0-305.el8 · AlmaLinux:8Package registry (OSV)
debian:linux5.8.14-1 · Debian:12Package registry (OSV)
debian:linux-4.194.19.152-1~deb9u1 · Debian:9Package registry (OSV)
opensuse:kernel-debug4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-default4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-default-base5.3.18-lp152.50.1.lp152.8.10.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-docs4.12.14-lp151.28.71.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-kvmsmall4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-obs-build4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-obs-qa4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-preempt5.3.18-lp152.47.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-source4.12.14-lp151.28.71.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-syms4.12.14-lp151.28.71.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:kernel-vanilla4.12.14-lp151.28.71.2 · openSUSE:Leap 15.1Package registry (OSV)
red hat:bpftool0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bpftool-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-abi-whitelists0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debug-devel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debuginfo0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-devel0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-doc0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:kernel-tools0:3.10.0-1160.11.1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:kernel-azure4.12.14-8.47.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP1Package registry (OSV)
suse:kernel-default4.12.14-122.41.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-default-base5.3.18-24.29.2.9.9.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-docs4.12.14-122.41.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)

+8

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records