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Public proof of conceptFix available

CVE-2020-25705

A public proof of concept exists; no exploitation attested.

  • Published2020-11-17
  • WeaknessCWE-330

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 in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version

Timeline

dates in UTC
  1. 2020-11-1702:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-25705?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25705?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
Linux linux kernel
BranchAffectedFixed in
5.10< 5.10.05.10.0

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.

Vendor advisories

  • ICSA-21-131-03 CISA32 known affected

    Siemens Linux-based Products (Update J)

    RUGGEDCOM RM1224 family (6GK6108-4AM00) · SCALANCE M-800 family · SCALANCE S615 (6GK5615-0AA00-2AA2) · +29 more

Full record on NVD

Fix

  1. Vendor fix CISA ICSA-21-131-03 · 6 productsUpdate to V2.2.28 or later version
  2. Vendor fix CISA ICSA-21-131-03 · 3 productsUpdate to V6.4 or later version
  3. Vendor fix CISA ICSA-21-131-03 · 1 productUpdate to V3.0 SP1 or later version
  4. Vendor fix CISA ICSA-21-131-03 · 1 productUpdate to V2.1.3 or later version
  5. Vendor fix CISA ICSA-21-131-03 · 1 productUpdate to V8.7.1.3 or later version
  6. Vendor fix CISA ICSA-21-131-03 · 2 productsUpdate to V3.3 or later version

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedtdwyer/CVE-2020-25705nanopathi/linux-4.19.72_CVE-2020-25705
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.4read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-330read 2026-10-23
  • NVDweakness (CWE)CWE-330read 2026-10-23
  • FIRST EPSSEPSS score6.7 %2026-10-22
  • PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2020-11-17
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-25705?

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version

Is CVE-2020-25705 actively exploited?

Active exploitation of CVE-2020-25705 has not been confirmed. Its EPSS score was 6.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25705?

CVE-2020-25705 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

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