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Noroxi
NVD / CVE Program· CNA redhat

CVE-2020-25705: A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports.

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 6.6% (FIRST EPSS); higher than 93.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-240.15.1.el8_3; linux (Debian:12) 5.9.6-1; linux (Debian:9) 4.9.246-1.
  • Mentioned 6 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-240.15.1.el8_3; linux (Debian:12) 5.9.6-1; linux (Debian:9) 4.9.246-1 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 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

HighCVSS 7.4 · v3.1—Proof of concept Fix available
Published
Nov 16, 2020
Updated
Jun 16, 2026
EPSS
6.6% · 93th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
29 / 40 · 7.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 6.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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  • when exploit code appears or is weaponized
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  • 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

Affected versions

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

  • linux linux kernelbefore 5.10.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0

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 Siemens Lunux 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 v2.1affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-240.15.1.el8_34.18.0-240.15.1.el8_3
Debian:12linuxbefore 5.9.6-15.9.6-1
Debian:9linuxbefore 4.9.246-14.9.246-1
Debian:9linux-4.19before 4.19.160-2~deb9u14.19.160-2~deb9u1
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.83.14.12.14-lp151.28.83.1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.50.15.3.18-lp152.50.1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.54.15.3.18-lp152.54.1
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.54.15.3.18-lp152.54.1
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.50.15.3.18-lp152.50.1
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-default-basebefore 5.3.18-lp152.54.1.lp152.8.12.15.3.18-lp152.54.1.lp152.8.12.1
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.54.25.3.18-lp152.54.2
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.50.15.3.18-lp152.50.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.50.15.3.18-lp152.50.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.54.15.3.18-lp152.54.1
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.50.15.3.18-lp152.50.1

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2020-27675Oct 22, 2020 · An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    18Monitor
  • ← EarlierCVE-2020-27152Nov 6, 2020 · An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2.
    22Monitor
  • Later →CVE-2020-28915Nov 18, 2020 · A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read k
    23Monitor

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-devel4.18.0-240.15.1.el8_3 · AlmaLinux:8Package registry (OSV)
debian:linux5.9.6-1 · Debian:12Package registry (OSV)
debian:linux-4.194.19.160-2~deb9u1 · Debian:9Package registry (OSV)
opensuse:kernel-debug5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default-base5.3.18-lp152.50.1.lp152.8.10.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-docs5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-build5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-qa5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-preempt5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-source5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-syms5.3.18-lp152.50.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-vanilla4.12.14-lp151.28.83.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:sca-patterns-sle121.0.8-2.2 · openSUSE:TumbleweedPackage registry (OSV)
red hat:kernel-rt0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo-common-x86_640:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-devel0:4.18.0-240.15.1.rt7.69.el8_3 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
suse:kernel-azure4.12.14-16.34.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-default5.3.18-24.37.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-default-base5.3.18-24.37.1.9.13.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)

+9

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:62020-11-14
Proof-of-concept repository on GitHubstars:02022-03-30

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.

  1. First PoC-3 d
  2. Published
  3. TodayNov 1, 2026+2176 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-330 · Use of Insufficiently Random Values

CVSS vector

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

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

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

All records