Vulnerability-Lookup

RHSA-2021:4511

Vulnerability from csaf_opensuse - Published: 2021-11-09 00:00 - Updated: 2026-09-20 11:18

Summary

security update for curl

Severity

Moderate

Notes

Title of the patch: security update for curl

Description of the patch: This security update provides a functional equivalent of RHSA-2021:4511. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2021:4511.

Patchnames: RHSA-2021:4511

CVE-2021-22876

6.1 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

Affected products

Recommended 7 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 8:curl-0:7.61.1-22.el8.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-0:7.61.1-22.el8.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-0:7.61.1-22.el8.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-devel-0:7.61.1-22.el8.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-devel-0:7.61.1-22.el8.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-minimal-0:7.61.1-22.el8.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:libcurl-minimal-0:7.61.1-22.el8.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2021-22898

5.3 (Medium)


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

Affected products

Recommended 7 products, the same list as for CVE-2021-22876

Threats

Impact moderate

CVE-2021-22925

4.3 (Medium)


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

Affected products

Recommended 7 products, the same list as for CVE-2021-22876

Threats

Impact moderate

References

14 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://www.suse.com/security/cve/CVE-2021-22876/	self
https://www.suse.com/security/cve/CVE-2021-22898/	self
https://www.suse.com/security/cve/CVE-2021-22925/	self
https://www.suse.com/security/cve/CVE-2021-22876	external
https://bugzilla.suse.com/1183933	external
https://www.suse.com/security/cve/CVE-2021-22898	external
https://bugzilla.suse.com/1186114	external
https://bugzilla.suse.com/1192450	external
https://www.suse.com/security/cve/CVE-2021-22925	external
https://bugzilla.suse.com/1188220	external
https://bugzilla.suse.com/1192447	external
https://bugzilla.suse.com/1200196	external

JSON

To clipboard

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          "text": "https://www.suse.com/security/cve/CVE-2021-22925"
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        {
          "category": "general",
          "text": "curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.",
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}

CVE-2021-22876 (GCVE-0-2021-22876)

Vulnerability from cvelistv5 – Published: 2021-04-01 17:45 – Updated: 2025-06-09 14:54

Summary

curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

Severity

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-09 14:54 UTC

CWE

CWE-359 - Privacy Violation (CWE-359)

Assigner

hackerone mitre root

References

10 references

URL	Tags
https://hackerone.com/reports/1101882	x_refsource_MISC
https://curl.se/docs/CVE-2021-22876.html	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202105-36	vendor-advisoryx_refsource_GENTOO
https://www.oracle.com//security-alerts/cpujul2021.html	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021052…	x_refsource_CONFIRM
https://cert-portal.siemens.com/productcert/pdf/s…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	https://github.com/curl/curl	Affected: 7.1.1 to and including 7.75.0

Show details on NVD website

JSON

To clipboard

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CVE-2021-22898 (GCVE-0-2021-22898)

Vulnerability from cvelistv5 – Published: 2021-06-11 15:49 – Updated: 2026-04-16 13:30

Summary

curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.

Severity

3.1 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-28 18:31 UTC

CWE

CWE-200 - Information Disclosure (CWE-200)

Assigner

hackerone mitre root

References

14 references

URL	Tags
https://hackerone.com/reports/1176461	x_refsource_MISC
https://curl.se/docs/CVE-2021-22898.html	x_refsource_MISC
https://github.com/curl/curl/commit/39ce47f219b09…	x_refsource_MISC
https://lists.apache.org/thread.html/rc713534b10f…	mailing-listx_refsource_MLIST
https://www.oracle.com//security-alerts/cpujul2021.html	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/07/21/4	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujan2022.html	x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/s…	x_refsource_CONFIRM
https://www.debian.org/security/2022/dsa-5197	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	https://github.com/curl/curl	Affected: 7.7 through 7.76.1

Show details on NVD website

JSON

To clipboard

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CVE-2021-22925 (GCVE-0-2021-22925)

Vulnerability from cvelistv5 – Published: 2021-08-05 00:00 – Updated: 2026-04-16 16:36

Summary

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

Severity

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-16 16:36 UTC

CWE

CWE-200 - Information Disclosure (CWE-200)

Assigner

hackerone mitre root

References

12 references

URL	Tags
https://hackerone.com/reports/1223882
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
http://seclists.org/fulldisclosure/2021/Sep/40	mailing-list
http://seclists.org/fulldisclosure/2021/Sep/39	mailing-list
https://www.oracle.com/security-alerts/cpuoct2021.html
https://security.netapp.com/advisory/ntap-2021090…
https://support.apple.com/kb/HT212805
https://support.apple.com/kb/HT212804
https://www.oracle.com/security-alerts/cpujan2022.html
https://cert-portal.siemens.com/productcert/pdf/s…
https://cert-portal.siemens.com/productcert/pdf/s…
https://security.gentoo.org/glsa/202212-01	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	https://github.com/curl/curl	Affected: curl 7.7 to and including 7.77.0

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2021:4511

CVE-2021-22876 (GCVE-0-2021-22876)

CVE-2021-22898 (GCVE-0-2021-22898)

CVE-2021-22925 (GCVE-0-2021-22925)

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Related by attack behaviour