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No exploitation reportedFix available

CVE-2022-4450

No exploitation reported by the sources we read.

  • Published2023-02-08
  • Fixed in300.0.12 · 111.25.0
  • WeaknessCWE-415

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

The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.

Timeline

dates in UTC
  1. 2023-02-0820:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2022-4450?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-4450?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD
openssl-src
BranchAffectedFixed in
300.0≥ 300.0.0, < 300.0.12300.0.12
111.25≥ 0.0.0-0, < 111.25.0111.25.0
111.25< 111.25.0111.25.0
OpenSSL
BranchAffectedFixed in
3.0≥ 3.0.0, < 3.0.83.0.8
1.1≥ 1.1.1, < 1.1.1t1.1.1t
Stormshield stormshield network security
BranchAffectedFixed in
4.x≥ 4.4.0, < 4.6.34.6.3
4.x≥ 4.0.0, < 4.3.164.3.16

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.

Packages

  • edk2-ovmfAlmaLinux:8all versions · fixed in 20220126gitbb1bba3d77-4.el8and 1 other package
  • edk2-toolsAlmaLinux:9all versions · fixed in 20221207gitfff6d81270b5-9.el9_2and 3 other packages
  • opensslAlmaLinux:9all versions · fixed in 1:3.0.1-47.el9_1and 3 other packages
  • opensslAlmaLinux:8all versions · fixed in 1:1.1.1k-9.el8_7and 3 other packages

Vendor advisories

  • ICSA-25-065-01 CISA3 products fixed · 3 known affected

    Hitachi Energy PCU400

    PCU400 versions 6.5 K and below · PCU400 versions 9.4.1 and below · PCULogger versions 1.1.0 and below

  • ICSA-24-205-02 CISA8 known affected

    Hitachi Energy AFS/AFR Series Products

    Hitachi Energy AFS650: <=9.1.08 · Hitachi Energy AFS660-C: <=7.1.05 · Hitachi Energy AFS665-B: <=7.1.05 · +5 more

  • ICSA-24-165-11 CISA26 known affected

    Siemens SCALANCE XM-400, XR-500

    SCALANCE XM408-4C (6GK5408-4GP00-2AM2) · SCALANCE XM408-4C (L3 int.) (6GK5408-4GQ00-2AM2) · SCALANCE XM408-8C (6GK5408-8GS00-2AM2) · +23 more

  • ICSA-24-004-02 CISA1 known affected

    Mitsubishi Electric Factory Automation Products

    Mitsubishi Electric FX5-OPC: <=1.006_

  • ICSA-23-320-08 CISA71 known affected

    Siemens SCALANCE Family Products

    SCALANCE XB205-3 (SC, PN) (6GK5205-3BB00-2AB2) · SCALANCE XB205-3 (ST, E/IP) (6GK5205-3BB00-2TB2) · SCALANCE XB205-3 (ST, E/IP) (6GK5205-3BD00-2TB2) · +68 more

  • ICSA-23-278-03 CISA2 known affected

    Mitsubishi Electric CC-Link IE TSN Industrial Managed Switch (Update A)

    Mitsubishi Electric CC-Link IE TSN Industrial Managed Switch NZ2MHG-TSNT8F2: <=firmware_05 · Mitsubishi Electric CC-Link IE TSN Industrial Managed Switch NZ2MHG-TSNT4: <=firmware_05

3 more advisories

Full record on NVD

Fix

  1. Update openssl-src to 300.0.12 · 111.25.0
  2. Vendor fix CISA ICSA-25-065-01 · 1 productIf IEC62351-3 secure for IEC104/DNP3 is used, then update to version 6.6.0 or latest
  3. Vendor fix CISA ICSA-25-065-01 · 1 productIf IEC62351-3 secure for IEC104/DNP3 is used, then update to version 9.4.2 or latest
  4. Vendor fix CISA ICSA-24-205-02 · 1 productAFS650: Update to AFS 650 firmware version 9.1.10
  5. Vendor fix CISA ICSA-24-205-02 · 3 productsAFS660-C, AFS665-B, AFS670-V2: Update to AFS 66x firmware version 7.1.08
  6. Vendor fix CISA ICSA-24-205-02 · 4 productsAFS670/675/677, AFR677: Update to AFS/AFR 67x firmware version 9.1.10
  7. Vendor fix CISA ICSA-24-165-11 · 26 productsUpdate to V6.6.1 or later version

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-04-23
  • OpenCVESSVC decisionnone—
  • CISA-ADPCVSS 3.17.52025-05-05
  • NVDCVSS 3.17.5read 2026-10-23
  • CISA-ADPweakness (CWE)CWE-4152025-05-05
  • NVDweakness (CWE)CWE-415read 2026-10-23
  • FIRST EPSSEPSS score28.6 %read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-02-08
Last Modified
2026-10-14
NVD status
Modified

Frequently asked questions

What is CVE-2022-4450?

The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.

Is CVE-2022-4450 actively exploited?

Active exploitation of CVE-2022-4450 has not been confirmed. Its EPSS score was 28.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-4450?

CVE-2022-4450 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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