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Noroxi
NVD / CVE Program· CNA redhat

CVE-2022-3515: A vulnerability was found in the Libksba library due to an integer overflow within the CRL parser.

Noroxi assessment

Priority: Plan (action score 40/100)

  • 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: 1.7% (FIRST EPSS); higher than 77.2% 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: libksba (AlmaLinux:8) 1.3.5-8.el8_6; libksba-devel (AlmaLinux:8) 1.3.5-8.el8_6; libksba (AlmaLinux:9) 1.5.1-5.el9_0.

Add it to your regular patch cycle. Upgrade to libksba (AlmaLinux:8) 1.3.5-8.el8_6; libksba-devel (AlmaLinux:8) 1.3.5-8.el8_6; libksba (AlmaLinux:9) 1.5.1-5.el9_0 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 vulnerability was found in the Libksba library due to an integer overflow within the CRL parser. The vulnerability can be exploited remotely for code execution on the target system by passing specially crafted data to the application, for example, a malicious S/MIME attachment.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Jan 12, 2023
Updated
Jun 17, 2026
EPSS
1.7% · 77th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.7%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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

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

Follow CVE-2022-3515

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

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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
gnupglibksba
gnupgvs-desktop
gnupggnupg
gpg4wingpg4win

Affected versions

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

  • gnupg gnupg2.1.0 and later · before 2.2.41
  • gnupg gnupg2.3.0 and later · before 2.4.0
  • gnupg libksbabefore 1.6.3
  • gnupg vs-desktop3.1.16 and later · before 3.1.26
  • gpg4win gpg4win2.0.0 and later · before 4.1.0

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 libksba

    • Fixed in libksba v1.6.2affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8libksbabefore 1.3.5-8.el8_61.3.5-8.el8_6
AlmaLinux:8libksba-develbefore 1.3.5-8.el8_61.3.5-8.el8_6
AlmaLinux:9libksbabefore 1.5.1-5.el9_01.5.1-5.el9_0
AlmaLinux:9libksba-develbefore 1.5.1-5.el9_01.5.1-5.el9_0
Alpine:v3.14libksbabefore 1.5.1-r11.5.1-r1
Alpine:v3.15libksbabefore 1.6.3-r01.6.3-r0
Alpine:v3.17libksbabefore 1.6.2-r01.6.2-r0
Debian:10libksbabefore 1.3.5-2+deb10u11.3.5-2+deb10u1
Debian:11libksbabefore 1.5.0-3+deb11u11.5.0-3+deb11u1
Debian:12libksbabefore 1.6.2-11.6.2-1
openSUSE:Leap Micro 5.2libksbabefore 1.3.5-150000.4.3.11.3.5-150000.4.3.1
openSUSE:Tumbleweedlibksbabefore 1.6.2-1.11.6.2-1.1
Red Hat:enterprise_linux:7::clientlibksbabefore 0:1.3.0-6.el7_90:1.3.0-6.el7_9
Red Hat:enterprise_linux:7::clientlibksba-debuginfobefore 0:1.3.0-6.el7_90:1.3.0-6.el7_9
Red Hat:enterprise_linux:7::clientlibksba-develbefore 0:1.3.0-6.el7_90:1.3.0-6.el7_9
Red Hat:enterprise_linux:8::baseoslibksbabefore 0:1.3.5-8.el8_60:1.3.5-8.el8_6
Red Hat:enterprise_linux:8::baseoslibksba-debuginfobefore 0:1.3.5-8.el8_60:1.3.5-8.el8_6
Red Hat:enterprise_linux:8::baseoslibksba-debugsourcebefore 0:1.3.5-8.el8_60:1.3.5-8.el8_6
Red Hat:enterprise_linux:8::crblibksba-develbefore 0:1.3.5-8.el8_60:1.3.5-8.el8_6
Red Hat:enterprise_linux:9::baseoslibksbabefore 0:1.5.1-5.el9_00:1.5.1-5.el9_0
Red Hat:enterprise_linux:9::baseoslibksba-debuginfobefore 0:1.5.1-5.el9_00:1.5.1-5.el9_0
Red Hat:enterprise_linux:9::baseoslibksba-debugsourcebefore 0:1.5.1-5.el9_00:1.5.1-5.el9_0
Red Hat:enterprise_linux:9::crblibksba-develbefore 0:1.5.1-5.el9_00:1.5.1-5.el9_0
Red Hat:rhel_aus:8.2::baseoslibksbabefore 0:1.3.5-8.el8_20:1.3.5-8.el8_2

+15

Same product

gnupg: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-47629Libksba before 1.6.3 is prone to an integer overflow vulnerability in the CRL signature parser.
    40Plan
  • CVE-2014-9087Integer underflow in the ksba_oid_to_str function in Libksba before 1.3.2, as used in GnuPG, allows remote attackers to cause a denial of se
    32Monitor
  • CVE-2016-4579Libksba before 1.3.4 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via unspecified vectors, related to
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2016-4355Jun 13, 2016 · Multiple integer overflows in ber-decoder.c in Libksba before 1.3.3 allow remote attackers to cause a denial of service (crash) via crafted
    31Monitor
  • ← EarlierCVE-2016-4356Jun 13, 2016 · The append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.3 allows remote attackers to cause a denial of service (out-of
    31Monitor
  • ← EarlierCVE-2016-4574Jun 13, 2016 · Off-by-one error in the append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.4 allows remote attackers to cause a denia
    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:libksba1.3.5-8.el8_6 · AlmaLinux:8Package registry (OSV)
almalinux:libksba-devel1.3.5-8.el8_6 · AlmaLinux:8Package registry (OSV)
alpine:libksba1.5.1-r1 · Alpine:v3.14Package registry (OSV)
debian:libksba1.6.2-1 · Debian:12Package registry (OSV)
opensuse:libksba1.3.5-150000.4.3.1 · openSUSE:Leap Micro 5.2Package registry (OSV)
red hat:libksba0:1.3.0-6.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libksba-debuginfo0:1.3.0-6.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libksba-debugsource0:1.3.5-8.el8_6 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libksba-devel0:1.3.0-6.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:redhat-virtualization-host0:4.5.3-202211170828_8.6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:redhat-virtualization-host-image-update0:4.5.3-202211170828_8.6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
rocky linux:libksba0:1.3.5-8.el8_6 · Rocky Linux:8Package registry (OSV)
suse:libksba1.3.0-24.3.1 · SUSE:OpenStack Cloud 9Package registry (OSV)
suse:libksba1.3.5-150000.4.3.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)

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.

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).

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

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/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.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records