Skip to content
Noroxi
NVD / CVE Program· CNA mitre

CVE-2021-45485: In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a has

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: 3.8% (FIRST EPSS); higher than 90% 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. No special conditions are required; it is repeatable.
  • Fixed version: linux (Debian:12) 5.14.6-1; connman (openSUSE:Leap 15.3) 1.41-bp153.2.3.1; dtb-aarch64 (openSUSE:Leap 15.3) 5.3.18-59.40.1, 5.3.18-150300.59.43.1.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:12) 5.14.6-1; connman (openSUSE:Leap 15.3) 1.41-bp153.2.3.1; dtb-aarch64 (openSUSE:Leap 15.3) 5.3.18-59.40.1, 5.3.18-150300.59.43.1 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

In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Dec 24, 2021
Updated
Aug 5, 2026
EPSS
3.8% · 90th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.8%

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.

Follow CVE-2021-45485

When you'll hear from us

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
netappe-series santricity os controller
netappsolidfire\, enterprise sds \& hci storage node
netappsolidfire \& hci management node
netappbrocade fabric operating system firmware
oraclecommunications cloud native core binding support function
oraclecommunications cloud native core network exposure function
oraclecommunications cloud native core policy
netappall flash fabric-attached storage 8300 firmware
netappall flash fabric-attached storage 8300
netappfabric-attached storage 8300 firmware
netappfabric-attached storage 8300

and 32 more

Check your site's encryption

This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

Run the SSL check

Affected versions

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

  • linux linux kernelbefore 4.4.276
  • linux linux kernel4.5 and later · before 4.9.276
  • linux linux kernel4.10 and later · before 4.14.240
  • linux linux kernel4.15 and later · before 4.19.198
  • linux linux kernel4.20 and later · before 5.4.133
  • linux linux kernel5.5 and later · before 5.10.51
  • linux linux kernel5.11 and later · before 5.12.18
  • linux linux kernel5.13 and later · before 5.13.3
  • netapp aff a400 firmwareall versions
  • netapp all flash fabric-attached storage 8300 firmwareall versions
  • netapp all flash fabric-attached storage 8700 firmwareall versions
  • netapp brocade fabric operating system firmwareall versions
  • netapp e-series santricity os controllerall versions
  • netapp fabric-attached storage 8300 firmwareall versions
  • netapp fabric-attached storage 8700 firmwareall versions
  • netapp fabric-attached storage a400 firmwareall versions
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.6-15.14.6-1
openSUSE:Leap 15.3connmanbefore 1.41-bp153.2.3.11.41-bp153.2.3.1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-150300.38.37.15.3.18-150300.38.37.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-38.34.15.3.18-38.34.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-150300.59.43.1.150300.18.27.15.3.18-150300.59.43.1.150300.18.27.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-59.40.1.18.25.15.3.18-59.40.1.18.25.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-preemptbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-preemptbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1

+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-2021-45469Dec 23, 2021 · In __f2fs_setxattr in fs/f2fs/xattr.c in the Linux kernel through 5.15.11, there is an out-of-bounds memory access when an inode has an inva
    31Monitor
  • ← EarlierCVE-2021-45480Dec 24, 2021 · An issue was discovered in the Linux kernel before 5.15.11.
    22Monitor
  • Later →CVE-2021-45486Dec 24, 2021 · In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.
    14Monitor

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
debian:linux5.14.6-1 · Debian:12Package registry (OSV)
opensuse:connman1.41-bp153.2.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:dtb-aarch645.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-64kb5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-debug5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default-base5.3.18-59.40.1.18.25.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-docs5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-obs-build5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-source-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-syms-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:bpftool0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
suse:connman1.41-bp153.2.3.1 · SUSE:Package Hub 15 SP3Package registry (OSV)
suse:kernel-azure5.3.18-38.34.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP3Package registry (OSV)
suse:kernel-default4.12.14-122.106.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-obs-build4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)

+8

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 ×1

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:02022-04-28

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. Published
  2. First PoC+124 d
  3. TodayNov 5, 2026+1776 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.

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.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm

CVSS vector

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

Show all references (4 more)

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

All records