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Public proof of conceptFix available

CVE-2022-27781

A public proof of concept exists; no exploitation attested.

  • Published2022-06-02
  • Fixed in9.0.6 · 8.2.12
  • WeaknessCWE-400 · CWE-835

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

libcurl provides the `CURLOPT_CERTINFO` option to allow applications torequest details to be returned about a server's certificate chain.Due to an erroneous function, a malicious server could make libcurl built withNSS get stuck in a never-ending busy-loop when trying to retrieve thatinformation.

Timeline

dates in UTC
  1. 2022-06-0214:15CVE publishedNVD

Versions per branch

NVD
Splunk universal forwarder
BranchAffectedFixed in
9.0≥ 9.0.0, < 9.0.69.0.6
8.2≥ 8.2.0, < 8.2.128.2.12
9.1= 9.1.0no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
11.0= 11.0no fix published
Haxx curl
BranchAffectedFixed in
7.83< 7.83.17.83.1

9 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As hackerone, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • https://github.com/curl/curl
    Affected
    • = Fixed in 7.83.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-12-19

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

  • curlUbuntu:Pro:16.04:LTSall versions · fixed in 7.47.0-1ubuntu2.19+esm4
  • curlUbuntu:Pro:14.04:LTSall versions · fixed in 7.35.0-1ubuntu2.20+esm11
  • curlUbuntu:22.04:LTSall versions · fixed in 7.81.0-1ubuntu1.2
  • curlUbuntu:20.04:LTSall versions · fixed in 7.68.0-1ubuntu2.11
  • curlUbuntu:18.04:LTSall versions · fixed in 7.58.0-2ubuntu3.18
  • curlSUSE:OpenStack Cloud Crowbar 9all versions · fixed in 7.60.0-4.38.1
  • curlSUSE:OpenStack Cloud Crowbar 8all versions · fixed in 7.37.0-37.76.1
  • curlSUSE:OpenStack Cloud 9all versions · fixed in 7.60.0-4.38.1

73 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-27781 Red Hat Product Security12 products fixed · 16 known affected

    curl: CERTINFO never-ending busy-loop

    rh-dotnet31-curl as a component of .NET Core 3.1 on Red Hat Enterprise Linux · rh-dotnet31-curl.src as a component of .NET Core 3.1 on Red Hat Enterprise Linux · rh-dotnet31-libcurl as a component of .NET Core 3.1 on Red Hat Enterprise Linux · +13 more

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) · +2 more

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more

  • ICSA-23-194-01 CISA11 known affected

    Siemens RUGGEDCOM ROX

    RUGGEDCOM ROX MX5000 · RUGGEDCOM ROX MX5000RE · RUGGEDCOM ROX RX1400 · +8 more

  • SSA-146325 Siemens ProductCERT11 known affected

    SSA-146325: Multiple Vulnerabilities in RUGGEDCOM ROX before V2.16

    RUGGEDCOM ROX MX5000 · RUGGEDCOM ROX MX5000RE · RUGGEDCOM ROX RX1400 · +8 more

  • RHSA-2022:8841 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP1 security update

1 more advisory

Full record on NVD

Fix

  1. Update Splunk universal forwarder to 9.0.6 · 8.2.12
  2. Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
  3. Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
  4. Vendor fix Siemens ProductCERT SSA-146325 · 11 productsUpdate to V2.16.0 or later version
  5. Vendor fix CISA ICSA-23-194-01 · 11 productsUpdate to V2.16.0 or later version
  6. Vendor fix Red Hat Product Security RHSA-2022:8841 · 1 productFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2022:8840 · 11 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Applications using the APR libraries, such as httpd, must be restarted for this update to take effect. After installing the updated packages, the http…

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-04-16
  • CISA-ADPCVSS 3.17.52026-04-16
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-400known since 2026-10-23
  • NVDweakness (CWE)CWE-835read 2026-10-23
  • FIRST EPSSEPSS score2.9 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

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
2022-06-02
Last Modified
2026-10-14
NVD status
Modified
GitHub Advisory
GHSA-xgr5-38f7-xqvv

Frequently asked questions

What is CVE-2022-27781?

libcurl provides the `CURLOPT_CERTINFO` option to allow applications torequest details to be returned about a server's certificate chain.Due to an erroneous function, a malicious server could make libcurl built withNSS get stuck in a never-ending busy-loop when trying to retrieve thatinformation.

Is CVE-2022-27781 actively exploited?

A proof-of-concept exploit exists for CVE-2022-27781, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-27781?

CVE-2022-27781 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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