CVE-2023-39325: HTTP/2 rapid reset can cause excessive work in net/http
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: 3.7% (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: Go standard library net/http 1.20.10, 1.21.3; golang.org/x/net golang.org/x/net/http2 0.17.0; Azure Linux 3.0 ARM 1.11.1-2, 1.12.12-1, 2.3.0-1.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Go standard library net/http 1.20.10, 1.21.3; golang.org/x/net golang.org/x/net/http2 0.17.0; Azure Linux 3.0 ARM 1.11.1-2, 1.12.12-1, 2.3.0-1 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
A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing. With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection. This issue is also fixed in golang.org/x/net/http2 for users manually configuring HTTP/2. The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the golang.org/x/net/http2 package; see the Server.MaxConcurrentStreams setting and the ConfigureServer function.
- BDU:2023-07013
- GHSA-4374-p667-p6c8
- ALSA-2023:5721
- ALSA-2023:5738
- ALSA-2023:5863
- ALSA-2023:5867
- ALSA-2023:6077
- GO-2023-2102
- openSUSE-SU-2023:0360-1
- openSUSE-SU-2024:13326-1
- openSUSE-SU-2024:13327-1
- openSUSE-SU-2024:13376-1
- openSUSE-SU-2024:13384-1
- openSUSE-SU-2024:13506-1
- openSUSE-SU-2024:14076-1
- openSUSE-SU-2026:11819-1
- RHEA-2024:1870
- RHSA-2023:5009
- RHSA-2023:5675
- RHSA-2023:5679
- Published
- Oct 11, 2023
- Updated
- Jun 17, 2026
- EPSS
- 3.7% · 90th percentile
- CWE
- CWE-770
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 · 3.7%
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.
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 |
| golang | http2 | cpe:2.3:a:golang:http2 |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| netapp | astra trident | cpe:2.3:a:netapp:astra_trident |
| netapp | astra trident autosupport | cpe:2.3:a:netapp:astra_trident_autosupport |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora37
- fedoraproject fedora38
- fedoraproject fedora39
- golang go1.20.0 and later · before 1.20.10
- golang go1.21.0 and later · before 1.21.3
- golang http2before 0.17.0
- netapp astra tridentall versions
- netapp astra trident autosupportall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.
Go standard library net/http
- before 1.20.10affected · semver
- 1.21.0-0 and later · before 1.21.3affected · semver
golang.org/x/net golang.org/x/net/http2
- before 0.17.0affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | delve | before 1.9.1-1.module_el8.8.0+3471+a62632a0 | 1.9.1-1.module_el8.8.0+3471+a62632a0 |
| AlmaLinux:8 | go-toolset | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-bin | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-docs | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-misc | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-race | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-src | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | golang-tests | before 1.19.13-1.module_el8.8.0+3625+a06035cf | 1.19.13-1.module_el8.8.0+3625+a06035cf |
| AlmaLinux:8 | grafana | before 7.5.15-5.el8_8.alma.1 | 7.5.15-5.el8_8.alma.1 |
| AlmaLinux:9 | go-toolset | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-bin | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-docs | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-misc | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-race | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-src | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | golang-tests | before 1.19.13-1.el9_2 | 1.19.13-1.el9_2 |
| AlmaLinux:9 | grafana | before 9.0.9-4.el9_2.alma.1 | 9.0.9-4.el9_2.alma.1 |
| AlmaLinux:9 | toolbox | before 0.0.99.3-10.el9_2 | 0.0.99.3-10.el9_2 |
| AlmaLinux:9 | toolbox-tests | before 0.0.99.3-10.el9_2 | 0.0.99.3-10.el9_2 |
| Alpine:v3.18 | go | from 1.20.0 · before 1.20.10-r0 | 1.20.10-r0 |
| Alpine:v3.19 | go | from 1.20.0 · before 1.21.3-r0 | 1.21.3-r0 |
| Debian:12 | golang-1.19 | from 0 | — |
+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-2023-39322Sep 8, 2023 · Memory exhaustion in QUIC connection handling in crypto/tls30Monitor
- ← EarlierCVE-2023-39323Oct 5, 2023 · Arbitrary code execution during build via line directives in cmd/go33Monitor
- Later →CVE-2023-45283Nov 9, 2023 · Insecure parsing of Windows paths with a \??\ prefix in path/filepath31Monitor
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 |
|---|---|---|
| Go standard library net/http | 1.20.10 | Vendor (CNA) |
| Go standard library net/http | 1.21.3 | Vendor (CNA) |
| golang.org/x/net golang.org/x/net/http2 | 0.17.0 | Vendor (CNA) |
| Azure Linux 3.0 ARM | 1.11.1-2 · coredns | Microsoft (MSRC) |
| Azure Linux 3.0 ARM | 1.12.12-1 · cert-manager | Microsoft (MSRC) |
| Azure Linux 3.0 ARM | 2.3.0-1 · blobfuse2 | Microsoft (MSRC) |
| Azure Linux 3.0 ARM | 8.7.3-2 · cf-cli | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 1.11.1-2 · coredns | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 1.12.12-1 · cert-manager | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 2.3.0-1 · blobfuse2 | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 8.7.3-2 · cf-cli | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 1.11.1-2 · coredns | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 1.29.0-2 · cri-tools | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 2.1.1-1 · blobfuse2 | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 3.5.12-1 · etcd | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 1.11.1-2 · coredns | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 1.29.0-2 · cri-tools | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 2.1.1-1 · blobfuse2 | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 3.5.12-1 · etcd | Microsoft (MSRC) |
| almalinux:delve | 1.9.1-1.module_el8.8.0+3471+a62632a0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:go-toolset | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-bin | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-docs | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-misc | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-race | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-src | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:golang-tests | 1.19.13-1.module_el8.8.0+3625+a06035cf · AlmaLinux:8 | Package registry (OSV) |
| almalinux:grafana | 7.5.15-5.el8_8.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:toolbox | 0.0.99.3-10.el9_2 · AlmaLinux:9 | Package registry (OSV) |
+45
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 | 2026-06-01 |
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+963 d
- TodayNov 11, 2026+1127 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.
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0471 · May 9, 2024(RedHat Güvenlik Güncellemesi)
- TR-23-0646 · Nov 20, 2023(SUSE Güvenlik Güncellemesi)
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-770 · Allocation of Resources Without Limits or ThrottlingCVSS 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)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- go.dev/cl/534235
- go.dev/issue/63417
- groups.google.com/g/golang-announce/c/iNNxDTCjZvo/m/UDd7VKQuAAAJ
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3OVW5V2DM5K5IC3H7O42YDUGNJ74J35O/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3SZN67IL7HMGMNAVLOTIXLIHUDXZK4LH/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3WJ4QVX2AMUJ2F2S27POOAHRC4K3CHU4/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4BUK2ZIAGCULOOYDNH25JPU6JBES5NF2/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5RSKA2II6QTD4YUKUNDVJQSRYSFC4VFR/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AVZDNSMVDAQJ64LJC5I5U5LDM5753647/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CLB4TW7KALB3EEQWNWCN7OUIWWVWWCG2/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2BBIDR2ZMB3X5BC7SR4SLQMHRMVPY6L/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ECRC75BQJP6FJN2L7KCKYZW4DSBD7QSD/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FTMJ3NJIDAZFWJQQSP3L22MUFJ3UP2PT/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSY7SXFFTPZFWDM6XELSDSHZLVW3AHK7/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HZQIELEIRSZUYTFFH5KTH2YJ4IIQG2KE/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPWCNYB5PQ5PCVZ4NJT6G56ZYFZ5QBU6/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSEGD2IWKNUO3DWY4KQGUQM5BISRWHQE/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.