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NVD / CVE Program· CNA hackerone

CVE-2021-22923: When curl is instructed to get content using the metalink feature, and a user name and password are used to download the metalink XML file,

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 2% (FIRST EPSS); higher than 80.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
  • Fixed version: curl (Alpine:v3.11) 7.79.0-r0; curl (Alpine:v3.12) 7.78.0-r0; curl (Debian:12) 7.79.1-1.
  • Mentioned 3 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to curl (Alpine:v3.11) 7.79.0-r0; curl (Alpine:v3.12) 7.78.0-r0; curl (Debian:12) 7.79.1-1 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

When curl is instructed to get content using the metalink feature, and a user name and password are used to download the metalink XML file, those same credentials are then subsequently passed on to each of the servers from which curl will download or try to download the contents from. Often contrary to the user's expectations and intentions and without telling the user it happened.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Aug 5, 2021
Updated
Oct 14, 2026
EPSS
2.0% · 80th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

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-2021-22923

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
haxxcurl
fedoraprojectfedora
netappcloud backup
netappclustered data ontap
netapphci management node
netappsolidfire
oraclemysql server
siemenssinec infrastructure network services
netapph300s firmware
netapph300s
netapph500s firmware
netapph500s

and 11 more

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This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

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Affected versions

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

  • fedoraproject fedora33
  • haxx curl7.27.0 and later · before 7.78.0
  • netapp cloud backupall versions
  • netapp clustered data ontapall versions
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500e firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700e firmwareall versions
  • netapp h700s firmwareall versions
  • netapp hci management nodeall versions
  • netapp solidfireall versions
  • oracle mysql server5.7.0 and later · up to 5.7.35 inclusive
  • oracle mysql server8.0.0 and later · up to 8.0.26 inclusive
  • siemens sinec infrastructure network servicesbefore 1.0.1.1
  • splunk universal forwarder8.2.0 and later · before 8.2.12
  • splunk universal forwarder9.0.0 and later · before 9.0.6
  • splunk universal forwarder9.1.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a https://github.com/curl/curl

    • curl 7.27.0 to and including 7.77.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.11curlfrom 7.27.0 · before 7.79.0-r07.79.0-r0
Alpine:v3.12curlfrom 7.27.0 · before 7.78.0-r07.78.0-r0
Debian:12curlbefore 7.79.1-17.79.1-1
openSUSE:Leap 15.2curlbefore 7.66.0-lp152.3.21.17.66.0-lp152.3.21.1
openSUSE:Leap 15.2curl-minibefore 7.66.0-lp152.3.21.17.66.0-lp152.3.21.1
openSUSE:Leap 15.3curlbefore 7.66.0-4.22.17.66.0-4.22.1
Red Hat:enterprise_linux:8::baseoscurlbefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoscurl-debuginfobefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoscurl-debugsourcebefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoscurl-minimal-debuginfobefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoslibcurlbefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoslibcurl-debuginfobefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoslibcurl-develbefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoslibcurl-minimalbefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:enterprise_linux:8::baseoslibcurl-minimal-debuginfobefore 0:7.61.1-18.el8_4.10:7.61.1-18.el8_4.1
Red Hat:rhel_eus:8.2::baseoscurlbefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoscurl-debuginfobefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoscurl-debugsourcebefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoscurl-minimal-debuginfobefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoslibcurlbefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoslibcurl-debuginfobefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoslibcurl-develbefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoslibcurl-minimalbefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3
Red Hat:rhel_eus:8.2::baseoslibcurl-minimal-debuginfobefore 0:7.61.1-12.el8_2.30:7.61.1-12.el8_2.3

+6

Same product

haxx: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t
    51Plan
  • CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API.
    47Plan
  • CVE-2024-2398HTTP/2 push headers memory-leak
    45Plan

Published before and after this one in the same product

  • ← EarlierCVE-2021-22898Jun 11, 2021 · curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcur
    13Monitor
  • ← EarlierCVE-2021-22922Aug 5, 2021 · When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML
    27Monitor
  • Later →CVE-2021-22925Aug 5, 2021 · curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl.
    23Monitor

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
alpine:curl7.79.0-r0 · Alpine:v3.11Package registry (OSV)
debian:curl7.79.1-1 · Debian:12Package registry (OSV)
opensuse:curl7.66.0-lp152.3.21.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:curl-mini7.66.0-lp152.3.21.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:curl0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:curl-debuginfo0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:curl-debugsource0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:curl-minimal-debuginfo0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libcurl0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libcurl-debuginfo0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libcurl-devel0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libcurl-minimal0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libcurl-minimal-debuginfo0:7.61.1-18.el8_4.1 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
rocky linux:curl0:7.61.1-18.el8_4.1 · Rocky Linux:8Package registry (OSV)
suse:curl7.60.0-4.25.1 · SUSE:OpenStack Cloud 9Package registry (OSV)
suse:curl-openssl17.37.0-70.71.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-319 · Cleartext Transmission of Sensitive Information

CVSS vector

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

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records