CVE-2021-22898
LOWCVSS v3.1: 3.1 · EPSS: 0.0013 (31.8 percentile)
Source data as of:
At a glance
- Severity
- LOW
- CVSS
- 3.1 v3.1 · NVD
- EPSS
- 0.0013 (31.8 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Information Exposure · NVD CWE
- Attack conditions (CVSS vector)
- NetworkNo privileges · Source: NVD Vector
- Affected vendors
- fedoraproject, oracle, haxx, splunk, siemens, debian
- Published
- 2021-06-11 · Modified: 2026-04-16
- References
- Jump to references (8)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Reference http://www.openwall.com/lists/oss-security/2021/07/21/4
- Vendor advisory https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- Reference https://curl.se/docs/CVE-2021-22898.html
- Patch https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
- Reference https://hackerone.com/reports/1176461
- Vendor advisory https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177…
- Distro https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html
- Distro https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html