CVE-2020-25613: An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1.
Noroxi assessment
Priority: Monitor (action score 31/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 3.8% (FIRST EPSS); higher than 90% 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: rubygem-abrt (AlmaLinux:8) 0.3.0-4.module_el8.5.0+2623+08a8ba32, 0.4.0-1.module_el8.3.0+6147+d0dfc1e4, 0.3.0-4.module_el8.5.0+259+8cec6917; rubygem-abrt-doc (AlmaLinux:8) 0.3.0-4.module_el8.5.0+2625+ec418553, 0.3.0-4.module_el8.5.0+2623+08a8ba32, 0.3.0-4.module_el8.5.0+259+8cec6917; rubygem-bson (AlmaLinux:8) 4.8.1-1.module_el8.5.0+117+35d1289b, 4.8.1-1.module_el8.4.0+2399+4e3a532a, 4.8.1-1.module_el8.3.0+6147+d0dfc1e4.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to rubygem-abrt (AlmaLinux:8) 0.3.0-4.module_el8.5.0+2623+08a8ba32, 0.4.0-1.module_el8.3.0+6147+d0dfc1e4, 0.3.0-4.module_el8.5.0+259+8cec6917; rubygem-abrt-doc (AlmaLinux:8) 0.3.0-4.module_el8.5.0+2625+ec418553, 0.3.0-4.module_el8.5.0+2623+08a8ba32, 0.3.0-4.module_el8.5.0+259+8cec6917; rubygem-bson (AlmaLinux:8) 4.8.1-1.module_el8.5.0+117+35d1289b, 4.8.1-1.module_el8.4.0+2399+4e3a532a, 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 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
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
- BDU:2021-01472
- GHSA-gwfg-cqmg-cf8f
- ALSA-2021:2584
- ALSA-2021:2587
- ALSA-2021:2588
- DLA-2391-1
- DLA-2392-1
- DLA-3408-1
- openSUSE-SU-2021:0471-1
- openSUSE-SU-2024:11310-1
- RHSA-2021:2104
- RHSA-2021:2229
- RHSA-2021:2230
- RHSA-2021:2584
- RHSA-2021:2587
- RHSA-2021:2588
- RHSA-2022:0581
- RHSA-2022:0582
- RLSA-2021:2584
- RLSA-2021:2587
- Published
- Oct 6, 2020
- Updated
- Jun 16, 2026
- EPSS
- 3.8% · 90th percentile
- CWE
- CWE-444
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 · 3.8%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Running WordPress? Scan your site free with WP Lens
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.
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 |
|---|---|---|
| ruby-lang | ruby | cpe:2.3:a:ruby-lang:ruby |
| ruby-lang | webrick | cpe:2.3:a:ruby-lang:webrick |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora32
- fedoraproject fedora33
- ruby-lang rubyup to 2.5.8 inclusive
- ruby-lang ruby2.6.0 and later · up to 2.6.6 inclusive
- ruby-lang ruby2.7.0 and later · up to 2.7.1 inclusive
- ruby-lang webrickup to 1.6.0 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | rubygem-abrt | before 0.3.0-4.module_el8.5.0+2623+08a8ba32 | 0.3.0-4.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-abrt | before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4 | 0.4.0-1.module_el8.3.0+6147+d0dfc1e4 |
| AlmaLinux:8 | rubygem-abrt | before 0.3.0-4.module_el8.5.0+259+8cec6917 | 0.3.0-4.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-abrt | before 0.4.0-1.module_el8.5.0+118+1ab773e1 | 0.4.0-1.module_el8.5.0+118+1ab773e1 |
| AlmaLinux:8 | rubygem-abrt | before 0.3.0-4.module_el8.5.0+2625+ec418553 | 0.3.0-4.module_el8.5.0+2625+ec418553 |
| AlmaLinux:8 | rubygem-abrt | before 0.4.0-1.module_el8.4.0+2399+4e3a532a | 0.4.0-1.module_el8.4.0+2399+4e3a532a |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.3.0-4.module_el8.5.0+2625+ec418553 | 0.3.0-4.module_el8.5.0+2625+ec418553 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.3.0-4.module_el8.5.0+2623+08a8ba32 | 0.3.0-4.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.3.0-4.module_el8.5.0+259+8cec6917 | 0.3.0-4.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.4.0-1.module_el8.5.0+118+1ab773e1 | 0.4.0-1.module_el8.5.0+118+1ab773e1 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.4.0-1.module_el8.4.0+2399+4e3a532a | 0.4.0-1.module_el8.4.0+2399+4e3a532a |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4 | 0.4.0-1.module_el8.3.0+6147+d0dfc1e4 |
| AlmaLinux:8 | rubygem-bson | before 4.8.1-1.module_el8.5.0+117+35d1289b | 4.8.1-1.module_el8.5.0+117+35d1289b |
| AlmaLinux:8 | rubygem-bson | before 4.8.1-1.module_el8.4.0+2399+4e3a532a | 4.8.1-1.module_el8.4.0+2399+4e3a532a |
| AlmaLinux:8 | rubygem-bson | before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 | 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 |
| AlmaLinux:8 | rubygem-bson | before 4.3.0-2.module_el8.5.0+2625+ec418553 | 4.3.0-2.module_el8.5.0+2625+ec418553 |
| AlmaLinux:8 | rubygem-bson | before 4.3.0-2.module_el8.5.0+259+8cec6917 | 4.3.0-2.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-bson | before 4.5.0-1.module_el8.5.0+250+ba22dbf7 | 4.5.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-bson | before 4.5.0-1.module_el8.5.0+2623+08a8ba32 | 4.5.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.3.0-2.module_el8.5.0+2625+ec418553 | 4.3.0-2.module_el8.5.0+2625+ec418553 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.5.0-1.module_el8.5.0+250+ba22dbf7 | 4.5.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.3.0-2.module_el8.5.0+259+8cec6917 | 4.3.0-2.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.5.0-1.module_el8.5.0+2623+08a8ba32 | 4.5.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 | 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 |
+96
Same product
ruby-lang: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-17405Ruby before 2.4.3 allows Net::FTP command injection.57Plan
- CVE-2008-3656Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick i52Plan
- CVE-2021-28966In Ruby through 3.0 on Windows, a remote attacker can submit a crafted path when a Web application handles a parameter with TmpDir.47Plan
Published before and after this one in the same product
- ← EarlierCVE-2015-1855Nov 29, 2019 · verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does no24Monitor
- ← EarlierCVE-2020-10933May 4, 2020 · An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0.22Monitor
- Later →CVE-2021-31810Jul 13, 2021 · An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1.24Monitor
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:rubygem-abrt | 0.4.0-1.module_el8.4.0+2399+4e3a532a · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-abrt-doc | 0.4.0-1.module_el8.5.0+118+1ab773e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-bson | 4.8.1-1.module_el8.5.0+117+35d1289b · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-bson-doc | 4.8.1-1.module_el8.3.0+6147+d0dfc1e4 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mongo | 2.11.3-1.module_el8.3.0+6147+d0dfc1e4 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mongo-doc | 2.11.3-1.module_el8.3.0+6147+d0dfc1e4 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mysql2 | 0.5.3-1.module_el8.4.0+2399+4e3a532a · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mysql2-doc | 0.5.3-1.module_el8.5.0+118+1ab773e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-pg | 1.2.3-1.module_el8.3.0+6147+d0dfc1e4 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-pg-doc | 1.2.3-1.module_el8.3.0+6147+d0dfc1e4 · AlmaLinux:8 | Package registry (OSV) |
| alpine:ruby | 2.5.8-r1 · Alpine:v3.10 | Package registry (OSV) |
| debian:jruby | 9.3.9.0+ds-1 · Debian:12 | Package registry (OSV) |
| debian:ruby2.3 | 2.3.3-1+deb9u9 · Debian:9 | Package registry (OSV) |
| opensuse:ruby2.5 | 2.5.8-lp152.2.3.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:ruby2.7 | 2.7.3-3.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:rh-ruby25-ruby | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-ruby-debuginfo | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-ruby-devel | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-ruby-doc | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-ruby-irb | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-ruby-libs | 0:2.5.9-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-bigdecimal | 0:1.3.4-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-did_you_mean | 0:1.2.0-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-io-console | 0:0.4.6-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-json | 0:2.1.0-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-minitest | 0:5.10.3-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby25-rubygem-net-telnet | 0:0.1.1-9.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| rocky linux:ruby | 0:2.7.3-136.module+el8.4.0+594+11b6673a · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-abrt | 0:0.4.0-1.module+el8.5.0+668+665814fa · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-bson | 0:4.8.1-1.module+el8.4.0+594+11b6673a · Rocky Linux:8 | Package registry (OSV) |
+9
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2022-03-30 |
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.
- Published
- First PoC+540 d
- TodayNov 2, 2026+2219 d
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.
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
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0430 · May 31, 2021(RedHat Güvenlik Güncellemeleri Yayınladı)
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
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- hackerone.com/reports/965267
- lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/
- security.gentoo.org/glsa/202401-27
- security.netapp.com/advisory/ntap-20210115-0008/
- www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.