CVE-2020-28851: In x/text in Go 1.15.4, an "index out of range" panic occurs in language.ParseAcceptLanguage while parsing the -u- extension.
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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: 2.3% (FIRST EPSS); higher than 83.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: aardvark-dns (AlmaLinux:8) 2:1.0.1-27.module_el8.6.0+2878+e681bc44; buildah (AlmaLinux:8) 1:1.24.2-4.module_el8.6.0+2878+e681bc44; buildah-tests (AlmaLinux:8) 1:1.24.2-4.module_el8.6.0+2878+e681bc44.
Low priority for now. Upgrade to aardvark-dns (AlmaLinux:8) 2:1.0.1-27.module_el8.6.0+2878+e681bc44; buildah (AlmaLinux:8) 1:1.24.2-4.module_el8.6.0+2878+e681bc44; buildah-tests (AlmaLinux:8) 1:1.24.2-4.module_el8.6.0+2878+e681bc44 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
In x/text in Go 1.15.4, an "index out of range" panic occurs in language.ParseAcceptLanguage while parsing the -u- extension. (x/text/language is supposed to be able to parse an HTTP Accept-Language header.)
- Published
- Jan 2, 2021
- Updated
- Jun 16, 2026
- EPSS
- 2.3% · 83th percentile
- CWE
- CWE-129
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.3%
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.
Is your version affected? Check itNoroxi 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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| golang | go | cpe:2.3:a:golang:go |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- golang go1.15.4
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | aardvark-dns | before 2:1.0.1-27.module_el8.6.0+2878+e681bc44 | 2:1.0.1-27.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | buildah | before 1:1.24.2-4.module_el8.6.0+2878+e681bc44 | 1:1.24.2-4.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | buildah-tests | before 1:1.24.2-4.module_el8.6.0+2878+e681bc44 | 1:1.24.2-4.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | cockpit-podman | before 43-1.module_el8.6.0+2877+8e437bf5 | 43-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | conmon | before 2:2.1.0-1.module_el8.6.0+2877+8e437bf5 | 2:2.1.0-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | container-selinux | before 2:2.179.1-1.module_el8.6.0+2878+e681bc44 | 2:2.179.1-1.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | containernetworking-plugins | before 1:1.0.1-2.module_el8.6.0+2878+e681bc44 | 1:1.0.1-2.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | containers-common | before 2:1-27.module_el8.6.0+2878+e681bc44 | 2:1-27.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | crit | before 3.15-3.module_el8.6.0+2751+06427ca3 | 3.15-3.module_el8.6.0+2751+06427ca3 |
| AlmaLinux:8 | crit | before 3.15-3.module_el8.6.0+2877+8e437bf5 | 3.15-3.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | criu | before 3.15-3.module_el8.6.0+2877+8e437bf5 | 3.15-3.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | criu | before 3.15-3.module_el8.6.0+2751+06427ca3 | 3.15-3.module_el8.6.0+2751+06427ca3 |
| AlmaLinux:8 | criu-devel | before 3.15-3.module_el8.6.0+2877+8e437bf5 | 3.15-3.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | criu-devel | before 3.15-3.module_el8.6.0+2751+06427ca3 | 3.15-3.module_el8.6.0+2751+06427ca3 |
| AlmaLinux:8 | criu-libs | before 3.15-3.module_el8.6.0+2877+8e437bf5 | 3.15-3.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | criu-libs | before 3.15-3.module_el8.6.0+2751+06427ca3 | 3.15-3.module_el8.6.0+2751+06427ca3 |
| AlmaLinux:8 | crun | before 1.4.4-1.module_el8.6.0+2877+8e437bf5 | 1.4.4-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | fuse-overlayfs | before 1.8.2-1.module_el8.6.0+2877+8e437bf5 | 1.8.2-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | git-lfs | before 2.13.3-3.el8_6 | 2.13.3-3.el8_6 |
| AlmaLinux:8 | libslirp | before 4.4.0-1.module_el8.6.0+2877+8e437bf5 | 4.4.0-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | libslirp-devel | before 4.4.0-1.module_el8.6.0+2877+8e437bf5 | 4.4.0-1.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | netavark | before 2:1.0.1-27.module_el8.6.0+2878+e681bc44 | 2:1.0.1-27.module_el8.6.0+2878+e681bc44 |
| AlmaLinux:8 | oci-seccomp-bpf-hook | before 1.2.3-3.module_el8.6.0+2877+8e437bf5 | 1.2.3-3.module_el8.6.0+2877+8e437bf5 |
| AlmaLinux:8 | podman | before 2:4.0.2-6.module_el8.6.0+2878+e681bc44 | 2:4.0.2-6.module_el8.6.0+2878+e681bc44 |
+96
Same product
golang: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-7187The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import path (get/vcs.go only…54Plan
- CVE-2018-16873In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to remote code execution when executed with the -u flag…52Plan
- CVE-2021-38297Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function invocation from a WASM module, when…42Plan
Published before and after this one in the same product
- ← EarlierCVE-2020-29510Dec 14, 2020 · The encoding/xml package in Go versions 1.15 and earlier does not correctly preserve the semantics of directives during tokenization…23Monitor
- ← EarlierCVE-2020-29511Dec 14, 2020 · The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element namespace prefixes during tokenization…23Monitor
- Later →CVE-2021-3114Jan 26, 2021 · In Go before 1.14.14 and 1.15.x before 1.15.7, crypto/elliptic/p224.go can generate incorrect outputs, related to an underflow of the…27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:aardvark-dns | 2:1.0.1-27.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:buildah | 1:1.24.2-4.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:buildah-tests | 1:1.24.2-4.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:cockpit-podman | 43-1.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:conmon | 2:2.1.0-1.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:container-selinux | 2:2.179.1-1.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:containernetworking-plugins | 1:1.0.1-2.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:containers-common | 2:1-27.module_el8.6.0+2878+e681bc44 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:crit | 3.15-3.module_el8.6.0+2751+06427ca3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:criu | 3.15-3.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:criu-devel | 3.15-3.module_el8.6.0+2751+06427ca3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:criu-libs | 3.15-3.module_el8.6.0+2751+06427ca3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:git-lfs | 2.13.3-3.el8_6 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:podman | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:podman-docker | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:podman-gvproxy | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:podman-plugins | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:podman-remote | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:podman-tests | 2:4.2.0-3.el9 · AlmaLinux:9 | Package registry (OSV) |
| debian:golang-golang-x-text | 0.3.6-1 · Debian:12 | Package registry (OSV) |
| red hat:aardvark-dns | 2:1.0.1-27.module+el8.6.0+14673+621cb8be · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:buildah | 1:1.24.2-4.module+el8.6.0+14673+621cb8be · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:buildah-debuginfo | 1:1.24.2-4.module+el8.6.0+14673+621cb8be · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:kiali | 0:v1.24.7.redhat1-1.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh-istioctl | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh-mixc | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh-mixs | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh-pilot-agent | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
| red hat:servicemesh-pilot-discovery | 0:2.0.9-3.el8 · Red Hat:service_mesh:2.0::el8 | Package registry (OSV) |
+3
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 researchersFinders, 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).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-129 · Improper Validation of Array IndexCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.