CVE-2021-33195

Exp

Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.

Published: 2021-08-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-33195 is rated High Exploit Risk (74.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.20%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-33195

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-33195

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-18 3.14% 3.20% +0.06%
2 2026-06-15 0.03% 3.14% +3.11%
3 2025-11-21 — 0.03% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-33195

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 3.4 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-33195

OS Trackers for CVE-2021-33195

vendor priority summary link
alpine high CVE-2021-33195: 1 source package rows (go); 33 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 26. https://security.alpinelinux.org/vuln/CVE-2021-33195
debian not yet assigned CVE-2021-33195 not yet assigned priority: Debian including 1 source packages (golang-1.15), 1 status rows across 1 suites (bullseye): resolved 1. https://security-tracker.debian.org/tracker/CVE-2021-33195
gentoo high CVE-2021-33195: 1 GLSA(s) (202208-02), 1 atom(s) (dev-lang/go); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-33195
redhat medium — https://access.redhat.com/security/cve/CVE-2021-33195
suse medium CVE-2021-33195 severity moderate: SUSE including 29 source package names (1.0.1-build4.16.1:go1.16-1.16.5-1.17.1, 1.16-13.3:go1.16-1.16.5-1.17.1, …), 95 product×package rows across 23 product lines (Container bci/golang, Container trento/trento-runner, … (23 product lines)): Fixed 95. https://www.suse.com/security/cve/CVE-2021-33195/
ubuntu medium CVE-2021-33195 medium priority: Ubuntu including 5 source packages (golang-1.11, golang-1.15, golang-1.16, golang-1.7, golang-1.8), 72 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 54, ignored 10, needs-triage 6, released 2. https://ubuntu.com/security/CVE-2021-33195

Affected software / configurations for CVE-2021-33195

Vendor Product Version Raw CPE
golang go < 1.15.13 cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
golang go >= 1.16.0, < 1.16.5 cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
netapp cloud_insights_telegraf_agent — cpe:2.3:a:netapp:cloud_insights_telegraf_agent:-:*:*:*:*:*:*:*

References for CVE-2021-33195

cvelogic Threat Intelligence