01 Record

CVE-2021-22897

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The

MediumPUBLISHEDCNA: hackerone

CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

View raw JSON

02 Description

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

4.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 90.9% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-06-11 15:49Z5 YR AGO

Last updated

2026-10-14 10:21Z15 DAYS AGO

Reserved

2021-01-06

Assigning CNA

hackerone

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

CWE-840
CWE-668Exposure of Resource to Wrong SphereClass

Data version

5.2

Document digest

730cbae3e1d900ff3135d501eff4bb0fe09a35ec4140273f43676614f996fe1c

05 Affected products

VendorProductVersionsPlatforms

n/ahttps://github.com/curl/curl7.61.0 through 7.76.1—

06 References

hackerone.comhttps://hackerone.com/reports/1172857x_refsource_MISC
curl.sehttps://curl.se/docs/CVE-2021-22897.htmlx_refsource_MISC
github.comhttps://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511x_refsource_MISC
www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlx_refsource_MISC
www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20210727-0007/x_refsource_CONFIRM
www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfx_refsource_CONFIRM
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-389290.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html

07 Fixed in

Arch Linux

curl
Not affected

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.