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Fencer Vulns
medium 6.5

CVE-2021-22922 json

When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML…

published 2021-08-05 5 y ago modified 2026-10-14 26 d ago also EUVD-2021-10051 , JLSEC-2026-1335

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload. It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk.

Patch / fix

  • julia LibCURL_jll 7.81.0+0
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • curl Debian 14, Debian 13, Debian 12 7.79.1-1

debian advisories DEBIAN-CVE-2021-22922

  • curl RHEL 8 7.61.1-18.el8_4.1
  • libcurl RHEL 8 7.61.1-18.el8_4.1
  • libcurl-minimal RHEL 8 7.61.1-18.el8_4.1
  • curl RHEL 8.2 EUS 7.61.1-12.el8_2.3
  • libcurl RHEL 8.2 EUS 7.61.1-12.el8_2.3
  • libcurl-minimal RHEL 8.2 EUS 7.61.1-12.el8_2.3

red hat advisories RHSA-2021:3903RHSA-2021:3582

  • curl SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 7.60.0-11.23.1
  • curl SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +10 more 7.60.0-3.47.1
  • curl SLE Module for Basesystem 15 SP3, SLE Module for Basesystem 15 SP2, SLE Micro 5.0 7.66.0-4.22.1
  • curl-openssl1 SLES 11-SECURITY 7.37.0-70.71.1
  • curl SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 7.60.0-4.25.1

suse advisories SUSE-SU-2021:2462-1SUSE-SU-2021:2440-1SUSE-SU-2021:2439-1SUSE-SU-2021:14768-1SUSE-SU-2021:2425-1

  • curl openSUSE Tumbleweed 7.79.1-1.1
  • curl openSUSE Leap 15.2 7.66.0-lp152.3.21.1
  • curl-mini openSUSE Leap 15.2 7.66.0-lp152.3.21.1
  • curl openSUSE Leap 15.3 7.66.0-4.22.1

opensuse advisories openSUSE-SU-2024:10582-1openSUSE-SU-2021:1088-1openSUSE-SU-2021:2439-1

  • curl Rocky Linux 8 7.61.1-18.el8_4.1

rocky linux advisories RLSA-2021:3582

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 7.78.0-r0

alpine advisories ALPINE-CVE-2021-22922

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl CBL-Mariner 2.0 7.76.0-5

azure linux advisories AZL-6361

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • curl Arch Linux 7.78.0-1

arch linux advisories AVG-2194

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-22922 updated cvss 6.5

curl: Content not matching hash in Metalink is not being discarded

  • Red Hat Ceph Storage 2 curl, libcurl
    affected: workaround, no fix planned “This flaw can be mitigated by upgrading the affected curl utility to version 7.78.0 or by disabling the metalink feature in your current build”
  • Red Hat JBoss Core Services jbcs-httpd24-curl jbcs-httpd24-curl
    affected: workaround, no fix available “This flaw can be mitigated by upgrading the affected curl utility to version 7.78.0 or by disabling the metalink feature in your current build”
  • Red Hat Enterprise Linux BaseOS (v. 8) curl 7.61.1-18.el8_4.1, libcurl 7.61.1-18.el8_4.1, libcurl-minimal 7.61.1-18.el8_4.1
    fixed: vendor fix “This flaw can be mitigated by upgrading the affected curl utility to version 7.78.0 or by disabling the metalink feature in your current build” RHSA-2021:3582
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) curl 7.61.1-12.el8_2.3, libcurl 7.61.1-12.el8_2.3, libcurl-minimal 7.61.1-12.el8_2.3
    fixed: vendor fix “This flaw can be mitigated by upgrading the affected curl utility to version 7.78.0 or by disabling the metalink feature in your current build” RHSA-2021:3903
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-curl, rh-dotnet21-libcurl Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31-curl, rh-dotnet31-libcurl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 9 curl, libcurl, curl-minimal, libcurl-minimal Red Hat Software Collections httpd24-curl, httpd24-libcurl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 6.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

4.33% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/1213175 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
julia LibCURL_jll
<7.81.0+0
7.81.0+0

Affected products

  • n/a https://github.com/curl/curl
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-840 Business Logic Errors
  • CWE-755 Improper Handling of Exceptional Conditions
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.