CVE-2020-25643

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 7.2Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.2
EG Score
7.2(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity72% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
88%
KEV
Not listed

Published

October 6, 2020

Last Modified

November 21, 2024

References (20)

Vendor Advisories for CVE-2020-25643(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-lts-xenial (4.4.0.197.172) @ trusty2026-05-23ubuntu
ubuntulinux-image-oem-20.04 (5.6.0.1048.44) @ focal2026-05-23ubuntu
ubuntulinux-image-virtual-hwe-20.04 (5.4.0.56.59) @ focal2026-05-23ubuntu
ubuntulinux-image-virtual-hwe-16.04-edge (4.15.0.126.113) @ bionic2026-05-23ubuntu
redhatkernel-rt-0:4.18.0-305.rt7.72.el82021-05-18redhat
redhatkernel-0:4.18.0-305.el82021-05-18redhat
redhatkernel-0:3.10.0-1160.11.1.el72020-12-15redhat
redhatkernel-rt-0:3.10.0-1160.11.1.rt56.1145.el72020-12-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 6 ecosystems)
Debian:9(2)
PackageVulnerable rangeFixed inDependents
linux4.9.107-1 ... 4.9.88-1~bpo8+1 (61 versions)4.9.240-1—
linux-4.194.19.132-1~deb9u1, 4.19.132-1~deb9u2, 4.19.146-1~deb9u14.19.152-1~deb9u1—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
linux4.19.118-1 ... 4.19.98-1~bpo9+1 (25 versions)4.19.152-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.14-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.14-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.14-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.14-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(7)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-25643?
CVE-2020-25643 is a high vulnerability published on October 6, 2020. A flaw was found in the HDLCPPP 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 pppcpparsecr function which can cause the system to crash or cause a denial of service. The highest threat from this…
When was CVE-2020-25643 disclosed?
CVE-2020-25643 was first published in the National Vulnerability Database on October 6, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-25643 actively exploited?
CVE-2020-25643 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 12.5% of all scored CVEs.
What is the CVSS score of CVE-2020-25643?
CVE-2020-25643 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2020-25643?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25643, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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